Good-Faith Reliance

Good-Faith Reliance

Showing that a warrant was defective does not always end in exclusion of the evidence. The ordinary remedy for an unconstitutional search is that the prosecution may not use its fruits in its case-in-chief, but United States v. Leon created an exception for searches made under a warrant.¹ The Court held that the exclusionary rule should not bar the use in the prosecution's case-in-chief of evidence obtained by officers acting in reasonable reliance on a warrant issued by a detached and neutral magistrate, even though the warrant is later found to be unsupported by probable cause.²

The reason lies in what suppression is for. The exclusionary rule is designed to deter police misconduct and not to punish the errors of judges, so it has no work to do where the police acted in reasonable reliance on a judgment the magistrate had already made.³ An officer who brings sworn facts to a neutral judicial officer and then follows the warrant that results has done what the system asks. Excluding the evidence would give that officer nothing to correct, because the mistake, if there was one, belonged to the magistrate. Deterrence aimed at someone who did nothing wrong improves no police practice and still costs the prosecution evidence of the crime.

Reliance is measured objectively, by what a reasonably well-trained officer would have known, so an officer's sincere trust in the warrant is not enough by itself.⁴ In Leon the affidavit supplied evidence sufficient to create disagreement among thoughtful and competent judges about probable cause, and for that reason the officers' reliance on the magistrate's determination was objectively reasonable.⁵ A close call of that kind is the paradigm case for the rule. A reasonably well-trained officer is not expected to be a legal technician, and cannot fairly be faulted for failing to out-guess a judge on a question that judges themselves could decide either way.⁶

The opposing view, which appears in the dissenting opinion in Leon, shows why the exception needs limits. The dissent argued that police have long been on notice that a warrant will be invalidated, and its fruits excluded, if officers failed to give the magistrate enough facts to evaluate probable cause independently, so that relying on the mere fact that a warrant issued has never been reasonable.⁷ That position did not carry the day, and the holding stands as stated above. The Court did, however, identify four situations in which a flawed warrant still results in exclusion, and each marks a way that reliance can fail to be reasonable: the officer misled the magistrate, the magistrate gave up the judicial role, or the defect in the warrant or its supporting affidavit was obvious.⁸ Because the exception depends on reasonable reliance, the bare fact that a warrant issued does not establish good faith. The limits are taken in turn below, beginning with the officer who gives the magistrate false information.

The Leon Rule

The Leon rule is a rule about remedy, and that fixes where it enters the analysis. By the time it matters, a court has already concluded, or is willing to assume, that the warrant was not supported by probable cause. In United States v. Leon the district court suppressed the evidence, and the Ninth Circuit affirmed after finding the informant's information stale and the informant's credibility unestablished under the two-part test of Aguilar v. Texas and Spinelli v. United States.⁹ The Government did not contest those findings in the Supreme Court and asked only whether the exclusionary rule should be modified so as not to bar evidence seized in reasonable, good-faith reliance on a search warrant.¹⁰ The Court held that it should be: the rule does not bar the prosecution from using, in its case-in-chief, evidence obtained by officers acting in reasonable reliance on a search warrant issued by a detached and neutral magistrate but ultimately found unsupported by probable cause.¹¹ Under that holding the warrant remains unsupported by probable cause, and the only question left is whether exclusion follows.

The first step marks the outer edge of the exception. Leon addressed unconstitutional searches made pursuant to a warrant, so the doctrine can protect only searches made under a warrant, and officers who searched without one cannot invoke it.¹² The second and third steps carry the reasoning behind the whole doctrine. Exclusion is designed to deter police misconduct and not to punish the errors of judges, so it has little to accomplish when the officers acted on a judgment the magistrate had already made.¹³ An officer who brings sworn facts to a neutral magistrate and executes the warrant that issues has followed the procedure the Fourth Amendment sets up. If the magistrate erred in finding probable cause, the error is the magistrate's, and suppressing the evidence would leave the officer with nothing to do differently next time.

The word reasonable keeps this from becoming a reward for carelessness. If sincere belief in the warrant were enough, the inquiry would collapse into testimony about what officers felt, and an officer who submitted a thin affidavit could simply say the warrant seemed fine. The Court instead measured objective reasonableness by what a reasonably well-trained officer would have known.¹⁴ That standard gives departments a reason to train officers to recognize an affidavit too weak to rely on. In Leon itself the affidavit provided evidence sufficient to create disagreement among thoughtful and competent judges about probable cause, so the officers' reliance on the magistrate's determination was objectively reasonable.¹⁵ A close call of that kind is the model case for the exception, since the reasonably well-trained officer is not expected to be a legal technician.¹⁶

The decision in Diaz, a fraud investigation, shows both sides of that line inside a single warrant. The warrant reached back to an earlier starting date for documents than the probable-cause affidavit supported, and the court held the evidence usable, because the officer in fact had probable cause to believe the scheme extended back that far and wrongly thought the affidavit said enough to cover it.¹⁷ The same warrant also authorized seizure of bank account records, even though the fraud described in the affidavit involved only cash transactions. For that portion Leon gave no protection, because nothing justified reaching those records and the officer could not reasonably rely on the magistrate's conclusion that probable cause extended to them.¹⁸ The first error was an honest drafting miss in a difficult kind of case, and the second had no support in the affidavit at all.

The flipped version falls within the first of the four limits, which the next section develops, because good faith is lost when the officer presented knowing or reckless falsehoods in the affidavit, including by intentionally omitting details that would have changed the magistrate's decision.¹⁹ The pair of examples isolates the variable that matters. The magistrate's judgment and the quality of the affidavit are the same in both, and only the officer's own conduct differs.

The dissenting opinion in Leon rejected the premise that reliance can make such a search reasonable. Its argument starts from the majority's own assumption that probable cause was missing. Reviewing courts must give substantial deference to a magistrate's determination and sustain the warrant in doubtful cases, so a conclusion that probable cause is lacking even after that deference means, on the dissent's view, that the officers' conduct was unreasonable as a matter of constitutional law.²⁰ The dissent added that officers have long been on notice that a warrant will be invalidated, and its fruits excluded, if they did not give the magistrate enough facts to evaluate probable cause responsibly and independently, so that relying on the mere fact that a warrant issued has never been reasonable.²¹ That view did not prevail, and the majority's rule governs. Its concern about officers who hand a magistrate too little echoes in the fourth limit on good faith, which withholds the exception when the affidavit is so lacking in indicia of probable cause that belief in its existence is entirely unreasonable.²²

False Affidavits

The first of the four limits on good faith turns on what the officer knew and told the magistrate. Leon withholds the exception where the officer presented knowing or reckless falsehoods in the affidavit used to obtain the warrant.²⁴ The limit follows from the premise of the whole doctrine. Reliance on a warrant is reasonable because the magistrate made an independent judgment that the officers can trust, and that judgment is only as sound as the information it rests on. The magistrate sees the case through the affidavit alone, in an application the officer writes and the suspect never gets to answer, so the officer controls the picture. An officer who bends that picture cannot claim to have relied in good faith on a decision the officer's own account produced. The deterrence reasoning that justifies the exception also points the other way here, because the fault lies in police conduct, which is what the exclusionary rule exists to deter.

Omissions count as falsehoods when they are made on purpose. The nutshell account of Leon illustrates the point with a warrant whose description of the items to be seized was too broad because the officer intentionally deceived the magistrate by leaving out details that would have led to a narrower description.²⁵ That example matters because overbreadth is otherwise a hard ground on which to defeat good faith. Where the offense suggests that many kinds of documents will be evidence, a warrant listing many categories rarely qualifies as facially deficient, since officers are not expected to examine each category for excess breadth.²⁶ The same breadth looks different when the officer held back facts that would have narrowed it. The inquiry then shifts from the face of the warrant to the officer's candor, and the first limit applies. A trap here is an omission made on purpose that students treat as a mere drafting gap.

An honest mistake falls on the other side of the line. In the Diaz fraud investigation, the warrant reached back to an earlier starting date than the affidavit supported, and the officer wrongly thought the affidavit said enough to cover that date even though the officer in fact had probable cause to believe the scheme ran that far back.²⁷ The court held that the evidence was usable on that point, which shows that an error in judging the affidavit's sufficiency does not become a knowing or reckless falsehood merely because the affidavit fell short.²⁸ Nothing in that account involves misleading the magistrate. The first limit therefore had nothing to catch, although the same warrant's authorization to seize bank records, which had no support in the affidavit, still lost protection under a different limit.²⁹

On an exam stem, the question is what the officer knew when swearing the affidavit and whether the magistrate was given that information. A deliberate omission, an invented detail, or a statement made with reckless disregard for its truth ends the Leon analysis for the prosecution. A sincere but mistaken belief that the affidavit was adequate leaves the first limit unmet, and the analysis moves on to the remaining limits.

Abandoned Judicial Role

The second limit on good faith concerns the official who issued the warrant rather than the officer who obtained it. Leon withholds the exception where the issuing magistrate wholly abandoned the judicial role, and the illustration the Court gave is a magistrate who became a member of the search party.³¹ The limit follows from what the exception assumes. Officers who rely on a warrant are treated as acting reasonably because a detached and neutral magistrate made a prior, independent judgment that they were entitled to trust, and Leon reasoned that exclusion has no deterrent work to do when police act on a judgment of that kind.³² As the earlier discussion of the neutral magistrate and the oath showed, the warrant clause places the issuing decision with an official outside the investigation, so that a judicial check stands between the police and the place they want to search.³³ A signer who has stopped acting as that check supplies no independent judgment, and the premise of the exception is gone.

The inquiry looks to the magistrate's actual role, because a signature appears on a warrant whether or not any real review occurred. A magistrate who takes part in the search party, and signs the warrant while serving as an investigator, has joined the side the warrant is meant to be checked against.³⁴ The officers then cannot claim reasonable reliance on a neutral judgment, since the judgment came from a participant in the very enterprise under review. The usual comfort of the exception, that any error belongs to a neutral judge rather than to the police, also fails here, because the person who erred is part of the police effort.

The word wholly marks the line between the two versions. A magistrate who misjudges probable cause, even badly, has made the kind of error that Leon treats as the judge's own and that the exception is built to forgive, while the second limit is reserved for a magistrate who has ceased to act as a judge at all.³⁵ A weak affidavit that the magistrate approved too easily is a separate problem, taken up in the fourth limit, which looks to the affidavit and not to the magistrate's role.³⁶ On an exam stem, the facts that trigger this limit describe what the magistrate did, such as joining the search party or working as an investigator, and say nothing about how persuasive the probable-cause conclusion was.

Facially Deficient Warrants

The third limit on good faith directs attention to the warrant document itself. Leon withholds the exception where the warrant is so facially deficient, as in failing to particularize the place to be searched or the things to be seized, that the executing officers cannot reasonably presume it to be valid.³⁸ The first two limits examined what the officer told the magistrate and what the magistrate did, but this one examines the paper the officers carry to the door. The reason lies in who can detect the defect. An officer deciding whether an affidavit establishes probable cause is making a legal judgment that the officer can fairly leave to the magistrate, while an officer holding a warrant can simply read it. A missing or plainly inadequate description therefore shows on the face of the document, and an officer who executes it cannot say the error was one that reasonable officers had no way to see. That matches the standard the whole exception uses, a reasonably well-trained officer who need not be a legal technician, yet can be expected to notice when the warrant says nothing about what may be taken.³⁹

The paradigm is Groh v. Ramirez. An ATF agent learned that a Montana ranch held automatic weapons, grenades, and launchers, and he prepared an application listing those items and the related purchase receipts, supported by a detailed affidavit.⁴⁰ He also completed the warrant form himself, and in the block that called for the person or property to be seized he typed a description of the Ramirez family's two-story blue house in place of the weapons. The warrant did not incorporate the itemized application, and the magistrate signed it. The Court held the search unconstitutional because the warrant did not describe the things to be seized at all, and it called the warrant so obviously deficient that no reasonable officer could have believed it valid.⁴¹ That is the rule from the earlier discussion of particular description, now doing work in the remedy analysis: the warrant itself, and not the application, must describe the things to be seized.⁴²

The agent's detailed affidavit did not rescue the warrant, and the reasons show why the defect counts as facial. Unless the items are set out in the warrant, or incorporated by reference with the affidavit present at the search, nothing in writing shows that the magistrate actually found probable cause to seize every item the affidavit mentions.⁴³ The magistrate in Groh might have accepted the showing for weapons while doubting that anything justified searching papers for purchase receipts, and a signature on the form does not reveal which.⁴⁴ The agent's restraint during the search did not fill the gap either, because that restraint came from the agents themselves and from no judicial officer.⁴⁵ The same logic reaches the good-faith inquiry. Leon excuses officers who rely on a magistrate's prior judgment, and when the warrant records no judgment about the things to be seized, and the officer who wrote the form is the one who left them out, there is no recorded judgment to rely on. A defective description can be cured by the affidavit only if the warrant used appropriate words of incorporation and the supporting document accompanies the warrant, and the Court stressed that it faced a warrant that did not describe the items at all, as distinguished from one containing a mere technical mistake or typographical error.⁴⁶

The limit is much harder to establish when the warrant does describe the things to be seized and the complaint is only that the description sweeps too widely. Where the offense suggests that a wide variety of documents will be evidence, as in a fraud investigation, a warrant listing many categories of documents rarely qualifies as facially deficient, because officers are not expected to examine each category to decide whether it might be overly broad.⁴⁷ This is the same functional point as before, applied in reverse. A missing description is visible to anyone who reads the warrant, while the excess in one category of a long list appears only when the list is compared against the affidavit and the law of particularity, and that comparison is the legal technician's task.

The two situations differ in the kind of defect each presents. The warrant in Groh had a gap that anyone holding it could see, while the fraud warrant's description was present, and its possible excess depended on a comparison that officers are not expected to make category by category. Minor flaws in describing the place follow the same pattern. An incorrect street number does not invalidate a warrant when it is still apparent which building is meant, so the third limit has nothing to catch.⁴⁸ Overbreadth that results from an officer's deliberate omission of details from the affidavit is a different matter, since that conduct falls under the first limit and not this one.⁴⁹

The dissent in Leon put the opposite weight on particularity. Writing about the companion case of Massachusetts v. Sheppard, in which it was accepted that the warrant completely failed to state with particularity the things to be seized, the dissent treated particularity as an express constitutional command and insisted that the warrant itself is the document that actually gives officers authority to invade a home, so the detail in the officers' affidavit cannot stand in for it.⁵⁰ That is a separate opinion and not the governing rule, which is the third limit's inquiry into whether officers could reasonably presume the warrant valid. Its emphasis on the document that confers authority still explains why a warrant like the one in Groh is the clearest case for the limit.

On an exam stem, the usual trap is the detailed affidavit. A thorough application tempts the reader to assume that the magistrate had every item in view and that the warrant must therefore be adequate. The third limit asks about the warrant, so a thorough affidavit that the warrant neither incorporates nor carries to the search does not repair a missing description, and a short stem fact that the form named only an address is the signal that the limit applies.

Affidavits Lacking Probable Cause

The fourth limit on good faith turns back to the affidavit, from a different angle than the first. The false-affidavit limit asks whether the officer misled the magistrate. This limit assumes the officer told the truth and asks whether the facts sworn could possibly have supported the warrant. Leon withholds the exception where the warrant issued on an affidavit “so lacking in indicia of probable cause as to render official belief in its existence entirely unreasonable.”⁵² The limit follows from what the exception protects. Good faith excuses an officer whose reliance on the magistrate was objectively reasonable, judged by what a reasonably well-trained officer would have known. The model of reasonable reliance is an affidavit strong enough to create disagreement among thoughtful and competent judges about probable cause.⁵³ An affidavit with no real indicia of probable cause sits at the opposite end, where there is nothing for judges to disagree about. A magistrate's signature cannot make an officer's belief reasonable when the papers beneath it say next to nothing.

The word entirely sets the height of the bar, and the “reasonably well-trained officer” fixes who is measured against it. Courts applying this limit stress that such an officer is not expected to be a legal technician, so an officer is not penalized for a drafting shortfall or for misjudging how much detail a close question requires.⁵⁴ The reason is practical. Probable cause is a judgment about fair probability rather than a formula, and officers who draft affidavits quickly, often in complex investigations, will sometimes miss the line by a little. If every near miss defeated good faith, the exception would do almost no work. The fourth limit therefore reaches only the affidavit so empty that an officer needs no legal training to see that it cannot support the warrant.

The clearest picture of such an affidavit comes from the bare-bones affidavits covered earlier. Illinois v. Gates addressed the magistrate's duty at issuance and not the good-faith exception, but the affidavits it described show what “lacking in indicia” looks like. One was a sworn statement that the affiant “has cause to suspect and does believe” that liquor was on certain premises. Another was a statement that the affiants had “received reliable information from a credible person and do believe” that heroin was stored in a home.⁵⁵ Each is a conclusion the affiant reached, with no fact the magistrate could evaluate, and the Court said the magistrate's action cannot be “a mere ratification of the bare conclusions of others.”⁵⁶ An officer who relies on a warrant resting on a paper of that kind has nothing on the page that a reasonably well-trained officer could treat as a basis for probable cause.

The two outcomes in Diaz show how the limit sorts a single warrant into two parts. In that fraud investigation the warrant reached back to an earlier starting date for the documents than the probable-cause affidavit supported. The officer in fact had probable cause to believe the scheme extended back that far and wrongly thought the affidavit set out enough information to cover the date. The court held that the fourth limit did not apply, noting the special problems investigators face in drafting warrants in fraud cases.⁵⁷ The same warrant also authorized seizure of bank account records, and there the result was the opposite. The prior fraud described in the affidavit involved only cash transactions, so the court found a “complete lack of justification” for reaching bank records. The officer could not reasonably rely on the magistrate's conclusion that probable cause extended to them, and good faith did not protect that portion of the warrant.⁵⁸

The two Diaz results differ in one variable: whether the affidavit gave any justification at all for the item in question. The date error was an error in how fully the affidavit was written, because the officer had genuine grounds and misjudged how much of them had reached the page. The bank-records authorization had nothing on the page to support it, and the affidavit's own account of the fraud, limited to cash, pointed away from those records. Because the court treated the bank-records authorization separately, one warrant can produce both results, with the protected portion surviving and the unsupported portion losing the exception's shelter.

On an exam stem, the deciding fact is whether the affidavit gave any justification at all for the item or place at issue. A stem reporting that the affidavit offered only the officer's belief, or described only cash transactions before the warrant reached bank records, points to the limit. A stem reporting that the officer had real grounds for the item but misjudged how much of them the affidavit needed to recite points the other way. The officer in the first situation may be entirely honest, and honesty does not help, since the limit examines the affidavit's contents and not the officer's candor. An affidavit the magistrate accepted too readily does not trigger the second limit either, because that limit looks to the magistrate's role.