Res Judicata and Collateral Estoppel: Claim and Issue Preclusion

Alan J. Belsky, Esq.
The Belsky Law Firm

Published October 23, 2026.

A lawsuit ends.

One of the parties later files another lawsuit involving the same dispute—or something closely related to it.

Can the parties litigate everything again?

Usually not.

Two related doctrines may prevent it:

Res judicata, commonly called claim preclusion, and

Collateral estoppel, commonly called issue preclusion.

The doctrines serve related purposes but operate differently.

Res judicata ordinarily prevents a party from relitigating the same claim, including matters that were raised or could have been raised in the first action.

Collateral estoppel ordinarily prevents a party from relitigating a particular issue of fact or law that was actually litigated and determined in an earlier proceeding.

The distinction matters.

A lawyer who says only, “That’s already been litigated,” has not completed the analysis.

The questions are:

What was litigated?

What was decided?

Was there a final judgment?

Was the issue necessary to that judgment?

Are these the same parties or persons sufficiently connected to them?

Is the second lawsuit asserting the same claim, or merely raising an issue decided in the first?

The answers determine which doctrine applies—and whether anything is actually precluded.

The Basic Difference: Claims Versus Issues

The Supreme Court of Maryland explained the distinction particularly well in Colandrea v. Wilde Lake Community Ass’n, Inc., 361 Md. 371, 388–92, 761 A.2d 899 (2000).

Where the second action involves the same cause of action between the same parties or their privies, res judicata can bar not merely matters actually litigated but matters that could have been litigated in the earlier action.

Collateral estoppel is narrower.

It concerns particular facts or issues that were actually litigated and determined in the earlier proceeding.

The shorthand is therefore:

Res judicata = claim preclusion.

Collateral estoppel = issue preclusion.

That shorthand is useful so long as the doctrines are not treated as interchangeable.

Res Judicata: The Three Maryland Requirements

Maryland generally asks three questions in determining whether res judicata applies:

Are the parties in the present litigation the same as, or in privity with, the parties to the earlier litigation?
Is the claim presented in the current action identical to the claim determined in the prior adjudication?
Was there a final judgment on the merits in the earlier action?

Colandrea, 361 Md. at 392.

If those requirements are satisfied, the second action ordinarily is barred not only as to matters actually litigated but also as to matters that properly could have been litigated in the first action.

“Same Claim” Does Not Mean “Same Count”

This is one of the most important practical aspects of Maryland res judicata law.

A plaintiff cannot necessarily avoid claim preclusion by changing the caption on the cause of action.

Suppose Lawsuit One alleges breach of contract.

The plaintiff loses.

The plaintiff then files Lawsuit Two arising from the same transaction but labels the claims:

negligence;
fraud;
unjust enrichment;
negligent misrepresentation; or
violation of a statute.

The plaintiff may argue:

Those causes of action were never decided.

That may miss the point.

Maryland generally employs a transactional approach to determine whether claims are the same for res judicata purposes.

The Transactional Approach

In Anne Arundel County Board of Education v. Norville, 390 Md. 93, 109–11, 887 A.2d 1029 (2005), the Supreme Court of Maryland explained that Maryland applies the transactional approach reflected in the Restatement (Second) of Judgments.

Under that approach, a claim includes rights to remedies against a defendant arising from the same transaction or series of connected transactions.

The inquiry therefore is not limited to:

Does Count I in the second complaint have the same legal name as Count I in the first?

Instead ask:

Do the claims arise from the same transaction, nucleus of operative facts, or series of connected transactions?

If they do, merely changing legal theories may not avoid preclusion.

You Usually Do Not Get to Split a Claim

Res judicata embodies an important litigation policy:

Bring the whole claim the first time.

A plaintiff ordinarily cannot litigate one legal theory arising from a transaction, wait to see whether it succeeds, and then bring another theory arising from the same transaction in a second lawsuit.

That is commonly described as claim splitting.

In deLeon v. Slear, 328 Md. 569, 580–81, 616 A.2d 380 (1992), the Supreme Court of Maryland applied res judicata where later claims arose from the same underlying transaction even though the plaintiff attempted to proceed under different legal theories.

The doctrine exists in substantial part to prevent serial litigation of disputes that should have been resolved together.

“Could Have Been Litigated” Is Powerful Language

This is where res judicata reaches farther than many litigants expect.

A party may respond:

But the first court never decided this theory.

That may be irrelevant.

If the second theory is part of the same claim for preclusion purposes and could have been raised in the first action, res judicata may bar it.

The doctrine does not merely prohibit a second attempt at arguments that actually lost.

It can prohibit the first attempt at an argument that should have been made in the earlier case.

That is why lawyers must think about preclusion before the first complaint is filed, not merely after the first case ends.

Collateral Estoppel Is Different: The Issue Ordinarily Must Actually Have Been Litigated

Collateral estoppel is narrower.

A matter that merely could have been litigated ordinarily is not enough.

The particular issue must have been actually litigated and determined in the earlier proceeding.

This creates one of the cleanest distinctions between the doctrines:

Res judicata can reach what could have been litigated.

Collateral estoppel ordinarily reaches what actually was litigated and decided.

That distinction alone resolves many otherwise confusing preclusion questions.

Maryland’s Collateral-Estoppel Analysis

Maryland courts generally examine four questions when determining whether collateral estoppel applies:

Is the issue decided in the prior adjudication identical to the issue presented in the current action?
Was there a final judgment on the merits?
Was the party against whom collateral estoppel is asserted a party, or in privity with a party, to the prior adjudication?
Was that party given a fair opportunity to be heard on the issue?

Colandrea, 361 Md. at 391.

Maryland cases also emphasize a closely related requirement:

The issue must have been actually determined and its determination must have been essential or necessary to the prior judgment.

That limitation prevents incidental observations and unnecessary findings from acquiring unintended preclusive force.

“Actually Litigated” Does Not Mean “Could Have Been Litigated”

This distinction deserves repetition.

Suppose a plaintiff sues over an automobile collision.

Liability and damages are contested.

The jury finds for the defendant because it concludes the defendant was not negligent.

The plaintiff later becomes involved in another proceeding in which the identical factual issue of the defendant’s negligence is material.

The prior determination may have collateral-estoppel consequences because negligence was actually litigated and determined.

But suppose the first case was resolved on a completely unrelated threshold ground and negligence was never litigated.

The mere fact that negligence could have been litigated does not ordinarily make it an actually litigated issue for collateral-estoppel purposes.

Claim preclusion and issue preclusion answer different questions.

The Issue Must Be Identical

Similarity is not necessarily enough.

Collateral estoppel requires identification of the precise issue decided previously.

For example:

Was Driver A negligent?

may not be identical to:

Was Driver A grossly negligent?

Likewise:

Did a physician breach the standard of care?

is not necessarily identical to:

Did the physician act with actual malice?

And:

Was an employee acting within the scope of employment?

may be distinct from:

Was the employer independently negligent in hiring or supervision?

The lawyer asserting collateral estoppel should identify exactly what the first factfinder necessarily decided.

The lawyer resisting it should do the same.

The Issue Must Have Been Necessary to the Judgment

Suppose a judge discusses three factual questions but ultimately resolves the case on only one.

Not every observation in the opinion necessarily becomes binding in later litigation.

Issue preclusion ordinarily attaches to determinations that were essential to the judgment.

This matters particularly when trial judges provide lengthy oral opinions or written memoranda containing alternative observations.

Do not simply search the prior opinion for a favorable sentence.

Determine whether that proposition actually formed a necessary basis for the judgment.

Finality Matters to Both Doctrines

Both res judicata and collateral estoppel depend upon sufficient finality.

This provides an important bridge to the separate Maryland doctrine governing interlocutory rulings by nisi prius judges.

An interlocutory ruling ordinarily presents a question of the trial court’s revisory authority.

A final adjudication may present a question of preclusion.

Those are very different concepts.

A denial of summary judgment by Judge A ordinarily does not become res judicata merely because Judge A decided it.

A final judgment following adjudication may have an entirely different effect.

Before arguing preclusion, therefore, ask:

Was there a final judgment?

A Final Judgment “On the Merits” Does Not Necessarily Mean a Jury Trial

A judgment can qualify as a judgment on the merits without a jury ever hearing evidence.

Summary judgment can produce a final judgment on the merits.

A dismissal with prejudice may have claim-preclusive consequences.

Other dispositive adjudications can qualify depending upon the nature and basis of the judgment.

The inquiry is functional, not ceremonial.

The question is not:

Did witnesses testify?

The question is:

What did the prior judgment finally determine, and what legal consequences does Maryland law assign to it?

Dismissal With Prejudice Can Be Dangerous

A dismissal “with prejudice” ordinarily carries consequences very different from a dismissal “without prejudice.”

A dismissal with prejudice generally indicates final disposition of the claim and may operate as an adjudication on the merits for res judicata purposes.

A party should therefore not casually agree to dismissal “with prejudice” without considering future claims arising from the same transaction.

Those two words can close doors well beyond the count immediately being dismissed.

Dismissal Without Prejudice Usually Signals Something Different

A dismissal without prejudice ordinarily permits refiling of the claim, subject to limitations and other procedural restrictions.

Because the claim has not ordinarily been finally adjudicated on its merits, claim preclusion generally does not operate in the same manner.

But “without prejudice” does not extend limitations.

Nor does it necessarily erase every ruling made during the earlier proceeding.

Always identify exactly what was dismissed and what was decided.

Jurisdictional Dismissals Require Careful Analysis

A dismissal because the court lacks subject-matter jurisdiction generally is not an adjudication of the substantive merits of the underlying tort or contract claim.

But the jurisdictional determination itself may have consequences if the requirements for issue preclusion are otherwise satisfied.

This illustrates an important point:

A judgment may lack claim-preclusive effect on the substantive cause of action while still potentially having issue-preclusive effect as to a particular matter actually and necessarily decided.

Never assume that the labels “dismissed” or “jurisdictional” answer every preclusion question.

Summary Judgment Can Have Full Preclusive Effect

A final summary judgment is not a lesser judgment.

If the court enters final judgment on the merits, res judicata may prevent the losing party from filing a new lawsuit asserting the same claim under a new theory.

And particular issues necessarily decided in reaching that judgment may have collateral-estoppel consequences.

This is another reason summary-judgment litigation deserves the same strategic attention as trial.

A party may be litigating not merely whether the present lawsuit survives.

The party may be determining what can ever be litigated again.

Default Judgments Present a Crucial Distinction

Default judgments demonstrate particularly well why claim preclusion and issue preclusion must be analyzed separately.

A default judgment can constitute a final judgment with claim-preclusive consequences.

But collateral estoppel ordinarily requires that the particular issue actually have been litigated.

In Porter Hayden Co. v. Bullinger, 350 Md. 452, 713 A.2d 962 (1998), the Supreme Court of Maryland addressed the limits of issue preclusion where a prior judgment had been entered by default.

Because issues resolved by default ordinarily have not actually been litigated in the traditional sense, the requirements of collateral estoppel may not be satisfied.

Thus:

A default judgment may end the claim without necessarily deciding every underlying issue for purposes of collateral estoppel.

That distinction can be enormously important in subsequent litigation.

Consent Judgments and Settlements Also Require Care

A settlement ends litigation because the parties agreed to end it.

That does not necessarily mean they actually litigated and judicially determined every disputed factual issue.

Maryland has recognized this distinction in considering collateral estoppel.

In Welsh v. Fort Bend Independent School District, 315 Md. 510, 555 A.2d 339 (1989), the Court addressed the preclusive implications of a consent judgment and emphasized the significance of whether an issue was actually litigated.

A consent judgment therefore should not automatically be treated as though a jury made factual findings after a contested trial.

But the settlement documents themselves matter.

Parties can define what is being released, preserved, dismissed, or reserved.

Draft them carefully.

Releases May Accomplish What Preclusion Does Not

Sometimes the important question following settlement is not res judicata or collateral estoppel at all.

It is:

What did the release say?

A broadly drafted release may extinguish claims that preclusion doctrine alone would not have barred.

Conversely, a carefully drafted reservation of rights may preserve matters that the parties intentionally excluded from settlement, although the effectiveness of a reservation must be analyzed in light of the claims and parties involved.

Do not use “res judicata” as a substitute for reading the settlement agreement.

Privity: The Parties Need Not Always Have Identical Names

Res judicata generally requires the same parties or persons in privity with them.

Collateral estoppel likewise requires careful attention to the relationship between the person against whom preclusion is asserted and the earlier litigation.

“Privity” is not simply a synonym for:

These people know each other, or

These entities have related interests.

The inquiry concerns whether the relationship is legally sufficient to justify binding a person to the result of litigation involving another.

Privity is therefore highly context-dependent.

Employer and Employee: Do Not Assume Automatic Privity for Every Purpose

Governmental, corporate, agency, employment, insurance, and indemnification relationships can create difficult privity questions.

The fact that an employer and employee share interests does not automatically answer every preclusion question.

Neither does common insurance representation.

The lawyer must determine:

whose legal rights were actually represented;
whose conduct was adjudicated;
who controlled or participated in the prior litigation;
what interests were aligned;
what judgment was entered; and
against whom preclusion is now asserted.

Privity should be demonstrated, not assumed.

Collateral Estoppel Can Apply Even When the Second Claim Is Different

This is the central function of issue preclusion.

Suppose Lawsuit One and Lawsuit Two involve different causes of action.

Res judicata may not bar the second claim.

But if a factual or legal issue essential to Lawsuit Two was actually litigated and necessarily determined in Lawsuit One, collateral estoppel may prevent relitigation of that issue.

The second lawsuit may therefore survive while one of its critical components is conclusively established—or conclusively defeated.

Sometimes that effectively decides the second case.

Defensive Collateral Estoppel

Collateral estoppel is frequently used defensively.

A plaintiff loses an issue in Litigation One.

The plaintiff later sues another defendant and attempts to relitigate the same issue.

The second defendant may attempt to use the earlier determination defensively:

You already litigated this issue and lost. You do not get another opportunity merely because you changed defendants.

Whether that argument succeeds depends upon Maryland’s requirements for issue preclusion, including identity of issue, finality, privity where required, and whether the party against whom estoppel is asserted had a full and fair opportunity to litigate.

Offensive Collateral Estoppel

The doctrine can also arise offensively.

A plaintiff may seek to use an earlier adverse determination against a defendant to establish an issue in later litigation.

Courts approach offensive nonmutual collateral estoppel with particular attention to fairness.

Questions can include:

whether the defendant had a full incentive to litigate the first case;
whether the later plaintiff could have joined the earlier action;
whether inconsistent prior judgments exist;
whether procedural opportunities differ; and
whether applying estoppel would otherwise be unfair.

Preclusion doctrine exists to promote finality and efficiency.

It is not intended to create procedural unfairness.

Mutuality Is Not the Whole Story

Older descriptions of collateral estoppel often emphasize “mutuality”—the idea that only someone who would have been bound by the earlier judgment may benefit from it.

Modern preclusion law is more nuanced.

The critical focus frequently is whether the person against whom preclusion is asserted had a full and fair opportunity to litigate the issue previously.

That does not mean identity of parties is irrelevant.

It means that “different plaintiff” or “different defendant” does not automatically end the analysis.

Administrative Decisions Can Have Preclusive Effect

Preclusion is not necessarily limited to prior court judgments.

Under appropriate circumstances, a final administrative adjudication can have collateral-estoppel consequences.

In Batson v. Shiflett, 325 Md. 684, 705, 602 A.2d 1191 (1992), the Supreme Court of Maryland recognized that an administrative agency determination may have preclusive effect where the agency acted in a judicial or quasi-judicial capacity, the issue was actually litigated, and its determination was necessary to the agency’s decision.

This is significant because many Maryland disputes begin before administrative agencies rather than courts.

Do Not Treat Every Agency Action as an Adjudication

An agency investigation is not necessarily an adjudication.

A licensing decision is not necessarily an adjudication.

An internal disciplinary determination is not necessarily an adjudication.

A benefits decision made without a contested hearing is not necessarily equivalent to a judicial determination.

The question is whether the administrative process possessed the characteristics Maryland law requires before preclusive effect is appropriate.

This can matter greatly in employment, professional licensing, insurance, workers’ compensation, zoning, and other administrative contexts.

Workers’ Compensation Can Create Its Own Preclusion Questions

Workers’ compensation proceedings illustrate the importance of defining the precise issue.

A Commission may determine:

whether an accidental injury occurred;
whether it arose out of and in the course of employment;
the nature of disability;
causation; or
entitlement to particular benefits.

A later civil action may involve overlapping facts but different claims and different parties.

Do not simply argue:

Workers’ compensation already decided this.

Identify the exact issue, determine whether it was actually and necessarily decided, and then analyze whether Maryland preclusion law gives that determination effect in the later proceeding.

Criminal and Civil Proceedings Require Special Care

A criminal proceeding may decide facts relevant to later civil litigation.

But the nature of the criminal disposition matters.

A conviction following trial is different from:

an acquittal;
a guilty plea;
a nolle prosequi;
probation before judgment;
dismissal; or
another disposition.

Not every disposition considered sufficiently final for one purpose is a final adjudication for collateral-estoppel purposes.

The docket label is only the beginning of the analysis.

Different Burdens of Proof Can Matter

Issue preclusion requires more than identical words describing the issue.

The burden of proof in the first proceeding can matter.

Suppose a party fails to establish an allegation under a heightened burden.

That does not necessarily establish that the proposition could not be proved under a lower burden in another proceeding.

Conversely, using a determination reached under a lower burden to establish conclusively an issue governed by a materially higher burden may raise a different problem.

The procedural setting of the first adjudication matters.

Federal and State Judgments Can Cross Court Systems

Preclusion does not stop at the courthouse door.

A federal judgment may have preclusive consequences in Maryland state court.

A Maryland judgment may have preclusive consequences in federal court.

The analysis can involve federal statutes, federal common law, and the preclusion rules applicable to the court that rendered the original judgment.

This becomes particularly important where litigation includes both:

federal constitutional claims under 42 U.S.C. § 1983; and
Maryland constitutional or common-law claims.

The decision whether to bring all available claims together can have consequences far beyond the first forum.

28 U.S.C. § 1738: State Judgments in Federal Court

Federal courts generally must give state judicial proceedings the same full faith and credit they would receive in the courts of the rendering state.

Thus, a litigant ordinarily cannot escape the preclusive effect of a Maryland judgment merely by moving the second lawsuit to federal court.

The federal courthouse is not a reset button.

Supplemental Jurisdiction Makes Claim Planning Important

Suppose a plaintiff files federal constitutional claims in federal court and also possesses related Maryland claims.

The plaintiff must consider whether to assert the state claims through supplemental jurisdiction.

If the federal court declines supplemental jurisdiction over state claims, however, that disposition is materially different from an adjudication of those claims on their merits.

Again:

Why did the first case end?

can be as important as:

How did it end?

Declining Supplemental Jurisdiction Is Not the Same as Losing the State Claim

Suppose the federal court dismisses the federal claims and then declines under 28 U.S.C. § 1367(c) to exercise supplemental jurisdiction over the remaining Maryland claims.

The federal court has not necessarily adjudicated those state claims on their merits.

That distinction can determine whether they remain available in Maryland court.

The dismissal order should be read carefully.

Never assume that every dismissal from federal court means every claim has been extinguished.

Preclusion Can Arise Within Related Proceedings

Preclusion is most commonly discussed as a defense to a later lawsuit.

But the important concept is the legal consequence of a qualifying prior final adjudication.

That is why the distinction between a final judgment and an interlocutory ruling matters so much.

Compare This With the Nisi Prius Rule

The distinction can be stated simply.

Interlocutory ruling

Judge A denies summary judgment.

The case continues.

Judge B later confronts the issue.

The question ordinarily concerns the circuit court’s continuing revisory authority over an interlocutory order.

Final adjudication

The court enters final judgment on the merits.

A party later attempts to litigate the same claim or a necessarily decided issue.

The question may now concern res judicata or collateral estoppel.

These doctrines are not contradictory.

They operate at different stages of finality.

“I Have New Evidence” Does Not Necessarily Defeat Res Judicata

A party who loses the first case sometimes discovers additional evidence and attempts to start again.

That does not automatically avoid claim preclusion.

If the first action resulted in a final judgment on the merits of the same claim, newly discovered evidence ordinarily does not create an unrestricted right to file another lawsuit.

The appropriate remedy may instead have been:

post-judgment relief;
a motion for new trial;
revisory relief where available;
appeal; or
another procedure within the original action.

Res judicata would lose much of its purpose if every losing litigant could begin again by locating another witness or document.

Fraud and Attacks on the Prior Judgment Are Separate Questions

An allegation that a prior judgment was procured through fraud or other serious misconduct may implicate rules governing direct or collateral attacks upon judgments.

It does not automatically erase the judgment.

The proper mechanism for challenging the prior judgment must be identified.

A new lawsuit is not necessarily that mechanism.

Preclusion Is Ordinarily an Affirmative Defense

Res judicata and collateral estoppel ordinarily operate as affirmative defenses.

The party relying upon them should raise and establish them appropriately.

The relevant record may include:

prior complaints;
answers;
dispositive motions;
transcripts;
verdict sheets;
agency decisions;
opinions;
orders; and
final judgments.

A docket entry stating only that judgment was entered may not establish what issue was actually determined.

Obtain the Prior Record

This is especially important with collateral estoppel.

If the argument is:

The jury already decided this issue,

the court needs to know what the jury actually decided.

A general verdict can make that difficult.

A special verdict or detailed verdict sheet can make it much easier.

Likewise, a summary-judgment order stating only “motion granted” may require review of the motion, opposition, hearing transcript, opinion, and other record materials to determine the basis of the judgment.

Issue preclusion depends upon what was actually and necessarily determined.

Prove it.

Verdict Sheets Can Affect Future Litigation

Trial lawyers should think prospectively about preclusion when preparing verdict sheets.

A specific finding can make the basis of a judgment unmistakable.

A general verdict may leave uncertainty.

That uncertainty may matter years later.

The verdict sheet therefore is not merely a mechanism for obtaining the current verdict.

It may become the best evidence of exactly what was adjudicated.

Settlement Drafting Can Affect Future Litigation Too

The same forward-looking approach applies to settlements.

If related claims are intended to be preserved, address them clearly where legally effective.

If the parties intend a global resolution, define it carefully.

If multiple defendants, claims, insurers, indemnitors, or proceedings exist, determine what is being released and what is not.

A settlement agreement should not accidentally create—or fail to create—the finality the parties intended.

Practical Example: Automobile Collision

Driver A and Driver B collide.

Driver A sues Driver B.

After trial, the jury specifically finds Driver A contributorily negligent.

Driver A later brings a related action arising from the same collision against another person.

Whether the later claim survives may involve both doctrines.

If it is the same claim against a party or privy satisfying res judicata requirements, claim preclusion may apply.

If it is a different claim but Driver A’s contributory negligence was actually litigated, necessarily determined, and the other collateral-estoppel requirements are met, issue preclusion may become decisive.

The analysis cannot stop at:

Same accident.

Practical Example: Medical Malpractice

A patient files malpractice litigation arising from surgery and receives a final adverse judgment.

The patient later sues another defendant under a different theory arising from the same treatment.

The first question is whether the second action constitutes the same claim under Maryland’s transactional approach.

If it does not, the next question may be whether a particular issue—causation, for example—was actually and necessarily determined in the first case.

If a jury specifically found that the alleged conduct did not cause the injury, that determination may have consequences beyond the first defendant.

But the precise parties, issues, burdens, verdict, and opportunity to litigate must be examined.

Practical Example: Contract Followed by Tort

A business sues another company for breach of contract arising from a failed transaction and loses after final judgment.

It then files another lawsuit alleging negligent misrepresentation arising from the same negotiations and transaction.

The second complaint may look different.

The claim may not be.

Under Maryland’s transactional approach, res judicata may prevent one commercial dispute from being converted into a succession of lawsuits merely by changing legal labels.

Practical Example: Administrative Proceeding Followed by Civil Action

An employee litigates a contested administrative proceeding.

The agency, acting quasi-judicially, necessarily determines a particular factual issue after a full hearing.

The employee later files a civil action in which the same issue is essential.

The court may need to determine whether Batson gives the administrative finding collateral-estoppel effect.

The question is not merely whether an agency previously considered the subject.

It is whether the agency actually adjudicated the issue in a proceeding possessing the characteristics Maryland law requires for preclusion.

Res Judicata Can Become a Plaintiff’s Problem Before the First Complaint Is Filed

Plaintiff’s counsel should ask at intake:

Has this dispute been litigated before?
Has any related lawsuit been filed?
Was there an administrative proceeding?
Was there arbitration?
Was there a consent judgment?
Was anything dismissed with prejudice?
Has a related party already sued?
Was there federal litigation?
Was there a bankruptcy proceeding involving the claim?
Is there a prior judgment arising from the same transaction?

Do not wait for the defendant’s motion to discover the client’s litigation history.

It Can Be a Defendant’s Most Efficient Defense

Defense counsel receiving a new complaint should immediately investigate prior litigation involving:

the plaintiff;
the transaction;
related defendants;
related entities;
administrative proceedings;
arbitration; and
federal litigation.

A valid preclusion defense can end a case before expensive merits discovery begins.

But it must be established precisely.

Do not merely attach a docket sheet and announce:

Res judicata.

A Practical Res Judicata Checklist

Ask:

What was the first action?
Who were the parties?
Who are the parties now?
Is anyone in privity?
What transaction or series of transactions produced the first claim?
What transaction produces the second?
Could the second theory have been asserted in the first action?
Was there a final judgment?
Was the judgment on the merits?
Was the first dismissal with or without prejudice?
Was jurisdiction lacking?
Were claims expressly reserved?
Was the judgment appealed?
What exactly did the final judgment dispose of?

If those questions remain unanswered, the res judicata analysis is incomplete.

A Practical Collateral Estoppel Checklist

Ask:

What precise issue is supposedly precluded?
Was that exact issue presented previously?
Was it actually litigated?
Who decided it?
Was there a contested hearing or trial?
Was the determination necessary to the judgment?
Was the judgment sufficiently final?
Against whom is estoppel now asserted?
Was that person a party or in legally sufficient privity?
Did that person have a full and fair opportunity to litigate?
Were the burdens of proof materially different?
Was the prior judgment by default or consent?
Does the verdict sheet identify the finding?
Were there alternative grounds for the judgment?
Would application of estoppel be procedurally fair?

Only then should counsel confidently say:

That issue has already been decided.

The Doctrines Protect More Than Defendants

Res judicata and collateral estoppel are often described as defenses.

But either side can benefit from finality.

A plaintiff who has established a particular issue may seek to prevent a defendant from relitigating it where the requirements of issue preclusion are satisfied.

A prevailing party may use an earlier judgment to narrow later litigation.

The doctrines protect judgments—not merely defendants.

The Policies Behind Preclusion

The doctrines serve several related purposes:

finality;
judicial economy;
consistency;
protection against repetitive litigation;
conservation of party and judicial resources;
respect for judgments; and
prevention of inconsistent outcomes.

There is also a basic fairness principle.

At some point, litigation must end.

A party ordinarily receives one full and fair opportunity to litigate a dispute—not an unlimited series of attempts until a favorable result is obtained.

But Finality Must Be Balanced Against Fairness

Preclusion can be severe.

A party may lose the opportunity ever to litigate an otherwise valid claim or issue.

Courts therefore require the elements of the doctrine to be established rather than applying “already litigated” as a generalized slogan.

Especially with collateral estoppel, the court must be satisfied that the party against whom estoppel is asserted had the required opportunity to litigate the issue.

Finality matters.

So does due process.

Bottom Line

Res judicata and collateral estoppel are related doctrines, but they do different work.

Res judicata—claim preclusion—asks whether a final judgment prevents litigation of the same claim.

It generally reaches not only matters actually litigated but matters that could have been litigated as part of that claim.

Maryland’s transactional approach means a litigant ordinarily cannot avoid the doctrine merely by changing legal theories or remedies while relying upon the same underlying transaction.

Collateral estoppel—issue preclusion—asks whether a particular factual or legal issue has already been actually litigated and necessarily determined.

It ordinarily requires an identical issue, sufficient finality, a party or qualifying privy against whom the doctrine may properly be asserted, and a full and fair opportunity to litigate.

The difference can be reduced to two questions:

Res judicata: Have you already had your opportunity to litigate this claim?

Collateral estoppel: Has this particular issue already been decided?

And the distinction from interlocutory trial-court rulings is equally important:

An interlocutory ruling ordinarily presents a revisory-power question.

A final judgment may present a preclusion question.

That is why a lawyer should never stop with:

“The court already ruled on this.”

The next questions are:

What kind of ruling was it?

Was it final?

What claim did it resolve?

What issue did it necessarily decide?

Who was bound by it?

And what does Maryland law prevent the parties from litigating again?

Those questions determine whether the first judgment merely ended one lawsuit—or also controls the next one.

Related Maryland Cases and Authorities

Colandrea v. Wilde Lake Community Ass’n, Inc., 361 Md. 371, 761 A.2d 899 (2000) — leading Maryland discussion distinguishing res judicata from collateral estoppel; identifies the requirements of both doctrines and emphasizes the difference between claims that could have been litigated and issues actually litigated.
Anne Arundel County Board of Education v. Norville, 390 Md. 93, 887 A.2d 1029 (2005) — explains Maryland’s transactional approach to identifying the same claim for res judicata purposes and recognizes that changing legal theories does not necessarily create a different claim.
deLeon v. Slear, 328 Md. 569, 616 A.2d 380 (1992) — applies claim-preclusion principles to subsequent claims arising from the same underlying transaction despite different legal theories.
Mackall v. Zayre Corp., 293 Md. 221, 443 A.2d 98 (1982) — discusses the distinction between claim preclusion and issue preclusion and the reach of matters litigated or that could have been litigated.
MPC, Inc. v. Kenny, 279 Md. 29, 367 A.2d 486 (1977) — addresses identification of the same cause of action for preclusion purposes.
Batson v. Shiflett, 325 Md. 684, 602 A.2d 1191 (1992) — leading Maryland authority concerning collateral-estoppel effect of administrative adjudications; considers whether the agency acted quasi-judicially, whether the issue was actually litigated, and whether its determination was necessary to the decision.
Porter Hayden Co. v. Bullinger, 350 Md. 452, 713 A.2d 962 (1998) — addresses the “actually litigated” requirement and the limits of collateral estoppel following a default judgment.
Welsh v. Fort Bend Independent School District, 315 Md. 510, 555 A.2d 339 (1989) — discusses collateral-estoppel principles in connection with a consent judgment and illustrates the significance of actual litigation.
Murray International Freight Corp. v. Graham, 315 Md. 543, 555 A.2d 502 (1989) — explains that an issue actually litigated and determined by a valid and final judgment may be conclusive in a later action when its determination was essential to the judgment.
Cosby v. Department of Human Resources, 425 Md. 629, 42 A.3d 596 (2012) — reiterates Maryland collateral-estoppel principles concerning actual litigation, finality, and necessity of the prior determination.
Rourke v. Amchem Products, Inc., 384 Md. 329, 863 A.2d 926 (2004) — discusses finality and the preclusive consequences of prior adjudications.
Lizzi v. Washington Metropolitan Area Transit Authority, 384 Md. 199, 862 A.2d 1017 (2004) — reiterates the principle that res judicata reaches matters actually decided as well as matters that could have been litigated in the prior action.
Restatement (Second) of Judgments §§ 24–27 — influential formulation of the transactional approach to claim preclusion and the actually-litigated-and-essential requirements for issue preclusion.
28 U.S.C. § 1738 — governs federal recognition of qualifying state judicial proceedings under the Full Faith and Credit Act.
28 U.S.C. § 1367 — governs supplemental jurisdiction over related state-law claims in federal litigation and can materially affect the analysis of subsequent state-court litigation.

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