Notice of an Insanity Defense

The notice rules answer a practical problem that arises before any rule is consulted: an insanity defense is very hard to meet when it first appears in the middle of trial. Lay testimony is unlikely to establish insanity or to rebut it, so both sides ordinarily depend on psychiatric examination and expert testimony.¹ A prosecutor who learns of the defense only when the defense expert is called must either ask for a continuance that stalls the trial or go forward with no examination of the defendant by an expert of the government's own, which leaves the jury with a one-sided picture of the defendant's mind. The pleadings give no warning, because a defendant need not raise insanity at arraignment and a simple not-guilty plea does not give the defense up. Advance notice repairs the problem by forcing the issue into the open while the case can still be scheduled around it, and its stated federal purpose is to let the prosecution have the defendant examined by a neutral expert.²

Most jurisdictions responded by legislating a notice requirement.³ Some states require a special plea of not guilty by reason of insanity as a prerequisite to the defense, but much more common is a written notice filed a set time before trial, and some statutes add that the defendant must list the witnesses and summarize the substance of the defense.⁴ Two exceptions soften these statutes: the defendant may still raise insanity if the prosecution's own evidence puts the matter in issue or if the defendant shows good cause for the failure to give notice, and otherwise the defense is lost.⁵ The statutes also usually authorize the court to commit the defendant for examination once notice has been given, which is why examination is taught beside notice in this chapter.⁶ The same device appears in Leland v. Oregon, where the Oregon statute at issue required notice of a purpose to show insanity as a defense.⁷ Even the dissent there, which objected to a different feature of Oregon's scheme, listed special pleading among the devices a state may use in handling the defense.⁸

Hypothetical Illustration

A defendant charged with arson wants to argue that she was legally insane when the fire was set. Her lawyer files written notice of the defense well before trial, and the prosecution has months to arrange its own psychiatric examination and prepare its cross-examination of the defense expert. The insanity issue can then be tried on the scheduled date without delay.

Change only the timing and the result reverses. A different defendant says nothing about insanity until the second day of trial, when his lawyer announces that a psychiatrist will testify that he was legally insane. The prosecution has never had the chance to examine him, so Rule 12.2(a) bars the defense unless the court finds good cause for the late notice, and even then the court may have to give the prosecution additional time to prepare.⁹

The federal rules treat insanity as one of three defenses that must be announced in advance, alongside alibi under Rule 12.1 and the public authority defense under Rule 12.3, and all three exist so that the government can prepare to answer at trial.¹⁰ They differ in how the duty is triggered. Alibi notice runs only after the prosecutor makes a written demand stating the time, date, and place of the offense, while the insanity notice is automatic, so the defense must act without being asked.¹¹ A defense lawyer therefore cannot wait for a government request that the rule does not contemplate.

Because notice makes the defendant commit to a strategy early, it draws a constitutional objection. The privilege against self-incrimination frees a defendant from supplying information that helps the prosecution, and the argument is that a notice rule makes the defendant identify the defense before the prosecution has put in its case.¹² State courts have consistently rejected that argument, and the Supreme Court's approval of advance notice of an alibi supports their result.¹³ In Williams v. Florida the state rule required the accused to disclose where he claimed to have been at the time of the crime and to list his supporting witnesses, and the prosecution had to name its rebuttal witnesses in return, and the Court upheld the rule.¹⁴ The Court reasoned that the state has a legitimate interest in guarding against an eleventh-hour defense, given how easily an alibi can be fabricated, and that the rule at most accelerated the timing of a disclosure the defendant planned to make at trial anyway.¹⁵ That accelerated-disclosure reasoning transfers to insanity with little strain. A defendant who means to call psychiatric experts at trial gives up nothing by naming the defense earlier, whereas a trial judge facing a surprise defense could be forced into a continuance that disrupts everyone involved.

Insanity differs from alibi in one respect that critics have used. An alibi denies that the defendant was at the scene, while an insanity defense ordinarily concedes the acts, so it has been argued that giving notice of insanity is an admission that the defendant did what is charged and that the requirement is therefore more vulnerable than alibi notice.¹⁶ Two safeguards also shape how defense-notice rules are written. The first is reciprocity: in Wardius v. Oregon the defendant had to name alibi witnesses while the state owed nothing in return, and the Court held that arrangement impermissible because, absent a strong showing of state interest to the contrary, discovery must be a two-way street.¹⁷ The second, which the Court has endorsed less directly, protects a defendant who changes strategy: the federal rules for alibi, insanity, and public authority each let the defendant withdraw the defense and keep the prosecution from referring to the withdrawn intention at trial.¹⁸ The sections that follow move from this shared premise to the operative text: the federal insanity notice in Rule 12.2(a), the Model Penal Code counterpart, the separate notice for expert evidence of a mental condition, and finally the consequences of noncompliance and withdrawal.

Federal Notice Rule

Rule 12.2(a) is short, and the most dependable way to apply it is as a checklist of five requirements plus a safety valve. The rule governs a defendant who intends to assert a defense of insanity at the time of the alleged offense, and it asks that defendant for a written notice, delivered to the right person, at the right time, with a copy placed in the court's file.²⁰ A federal defendant has no plea of not guilty by reason of insanity to enter, so the notice does the work that a special plea does in some states: the defendant pleads not guilty at arraignment and then serves the Rule 12.2 notice during the pretrial motion period.²¹ The duty is also automatic, which means the government never has to ask for the notice first, and a defense lawyer who waits for a request will wait past the deadline.²²

Exam Analysis Steps

Because the defense is safe only when every requirement is met, the rule is best run as a checklist in the order the rule states its elements. The steps are these:

Confirm that the defendant intends to assert insanity at the time of the alleged offense, which is the defense itself and not other evidence about the defendant's mental condition.
Confirm that the defendant gave the notice in writing, since a spoken announcement does not satisfy the rule.
Confirm that the writing went to an attorney for the government, and not only to the court.
Confirm that the notice came within the time for filing pretrial motions or at whatever later time the court set.
Confirm that a copy of the notice was filed with the clerk.
If any step fails, ask whether the court has found good cause to allow late notice, to grant additional trial-preparation time, or to make another appropriate order, because without such relief the defendant cannot rely on the defense.

The checklist looks bureaucratic until each element is matched to the problem it solves. The writing requirement creates a record that cannot be disputed later, so the parties never have to litigate what was said in a conversation. Directing the notice to an attorney for the government puts the party who must respond on alert, whereas a filing the judge alone sees would leave the prosecutor to discover the defense from the docket. The deadline, which is the time for pretrial motions unless the court sets another, ties the announcement to the stage at which the court is already sorting out defenses and scheduling trial. The clerk's copy then lets the court monitor compliance for itself, which matters when a dispute arises over whether the defense is still available.

The trigger for all of this is the defendant's intention, and its subject is one particular defense: insanity at the time of the alleged offense. The duty therefore arises when the defense lawyer decides to rely on insanity, well before the expert takes the stand. Rule 12.2 also contains a separate notice for expert evidence of a mental disease, defect, or other mental condition, which is taught below, so a lawyer who plans both uses must account for each requirement separately.²³ Competency to stand trial is a different question again and is outside this notice.

When a requirement is missed, the rule states the consequence itself: a defendant who fails to give the notice cannot rely on an insanity defense.²⁴ Forfeiture is what gives the deadline force. A rule with no consequence would invite tactical silence, since a defendant could hold the defense back until the prosecution had no time to find an examiner or gather records, and that surprise is exactly what advance notice exists to prevent. The wording of the rule quoted in United States v. Bartlett, 856 F.2d 1071 (8th Cir. 1988), shows the same structure in different words: written notice to the government's attorney, a copy filed with the clerk, a bar on raising insanity after noncompliance, and discretion to allow late filing for cause.²⁵

The good-cause exception keeps the rule from punishing delay that had nothing to do with tactics. On a showing of good cause, the court may allow the notice to be filed late, grant additional trial-preparation time, or make other appropriate orders.²⁶ Those options matter because they let the court cure any prejudice to the prosecution instead of choosing between barring the defense and ignoring the default. Late notice paired with extra time for the government restores most of what the deadline protects. A defendant seeking that relief needs a reason for the delay, because good cause is the only thing the rule offers in place of timeliness, and a delay with no explanation gives the court nothing to find. Excusing bare silence would reward the tactical delay the forfeiture rule was written to deter, which is why silence without a reason rarely earns relief.

Hypothetical Illustration

A defendant charged with bank robbery serves a written insanity notice on the prosecutor by the pretrial-motion deadline and files a copy with the clerk. He has met every requirement and may rely on the defense at trial.²⁷

In a second prosecution, new defense counsel misses the deadline because the client's psychiatric hospital records surfaced only afterward. The delay has an explanation unrelated to tactics, so the court may find good cause, allow late notice, and give the government extra time to arrange its own examination and prepare its cross-examination.²⁸

In a third, the defendant mentions to the prosecutor in a hallway conversation that she may plead insanity, but no written notice is ever served or filed. She cannot rely on the defense, because the conversation supplies neither the writing nor the clerk's copy, unless the court later finds good cause to allow written notice out of time.²⁹

The first and third defendants sit on opposite sides of the line because of the form of the notice, and the second differs from an ordinary missed deadline because of the explanation. Students lose this issue when they treat an oral heads-up to the prosecutor as notice, since the rule asks for a writing directed to the government's attorney and a copy for the clerk, and the prosecutor's actual awareness supplies neither.³⁰ The writing, the deadline, and the clerk's copy all exist to remove any dispute about whether notice was given, so a defendant who cannot point to them has only good cause left to argue. On an exam stem that reports a missed deadline, look first for a reason for the delay in the facts; a stem that supplies none points toward forfeiture.

Model Penal Code Notice

Model Penal Code § 4.03(2) states the notice requirement in one sentence: evidence of mental disease or defect excluding responsibility is not admissible unless the defendant, when entering the plea of not guilty or within ten days afterward, or at a later time the court permits for good cause, files a written notice of the purpose to rely on the defense.³² The same section also labels the defense an affirmative defense and requires that the verdict and judgment record an acquittal on this ground, a feature taken up later in the discussion of the special verdict.³³ The notice clause therefore sits inside a provision that follows the defense from pleading to judgment. Laid beside the federal rule from the preceding section, it has the same skeleton of a writing, a deadline, and a good-cause escape, and it differs in where the clock starts and in how the penalty is worded.

Exam Analysis Steps

Because the model provision turns on a short list of conditions, it is best applied as a sequence that ends in an admissibility question. The steps are these:

Identify whether the defendant intends to rely on mental disease or defect excluding responsibility, which is the defense whose evidence the provision regulates.
Determine the date on which the defendant entered the plea of not guilty, because that date starts the clock.
Check that a written notice of the purpose to rely on the defense was filed on that date or within the ten days that follow.³⁴
If the filing came later, ask whether the court permitted the late filing after finding good cause.
If neither a timely filing nor a good-cause permission is present, conclude that the evidence of mental disease or defect excluding responsibility is not admissible.³⁵

The first difference from the federal rule is the starting point. The model provision measures from the plea, while the federal rule measures from the time for filing pretrial motions or a later time the court sets.³⁶ Tying the deadline to the plea puts the decision at the first moment when the defendant formally takes a position on guilt, so the prosecution learns of the defense at the earliest natural point. A short fixed period then gives defense counsel time to investigate the client's history and consult an expert without letting the issue drift toward trial. The federal deadline depends on the court's pretrial schedule and so varies from case to case, whereas the model period is the same in every case. The ten-day figure is the model text's own choice, and a jurisdiction adopting a notice rule may select a different period, which fits the general pattern that states commonly require written notice at some set time before trial without agreeing on the number.³⁷

The second difference is the wording of the sanction. The federal rule says that a defendant who fails to give notice cannot rely on the defense, while the model provision says that the evidence is not admissible unless notice was filed.³⁸ The model version makes the consequence concrete because it operates at the moment the defendant tries to put proof before the factfinder: a judge who sees a psychiatrist on the witness list and no filed notice excludes the testimony. Since the defense ordinarily rests on expert proof, excluding that proof leaves the defendant with little of the defense, and the two formulations produce much the same result in practice. The wording still matters on an exam, because an answer should track the sanction that the governing text actually states, and the model text is a rule about evidence. A further textual difference is that the model provision speaks only of filing a written notice and does not itself describe separate delivery to the prosecutor, whereas the federal rule requires notice to an attorney for the government and a copy for the clerk.³⁹

Both provisions share an escape for good cause. Under the model text the court may permit a later filing for good cause, and that permission is what rescues a defendant who missed the ten days.⁴⁰ The escape exists because a flat deadline would otherwise punish delay that had nothing to do with tactics, such as counsel appointed late or hospital records that surface only after the deadline. A defendant needs a reason to invoke it, since good cause is all the provision offers in place of timeliness, and excusing unexplained silence would reward the tactical delay the deadline is meant to discourage. The federal rule lists remedies such as additional trial-preparation time, while the model text speaks only of permitting a later time, so the model court's tool is leave to file late.

The two defendants differ only in the date of filing and in whether any reason for lateness exists, which shows where the rule does its work. Students most often lose this issue by counting from the wrong starting point, applying the federal pretrial-motions deadline to a model-code problem or the reverse. When a stem recites the plea date, the model provision asks for a written notice by the tenth day after it, and when a stem refers to the time for pretrial motions, the federal rule is the one in play. A late filer under the model provision then faces the answer that the evidence is inadmissible unless the court finds good cause.⁴³

Notice of Expert Mental Evidence

Rule 12.2(b) creates a second pretrial notice duty, and its trigger is a kind of evidence, whatever defense the evidence is offered to support. A defendant who intends to introduce expert evidence relating to a mental disease or defect, or to any other mental condition, bearing on either the issue of guilt or the issue of punishment in a capital case, must notify an attorney for the government in writing within the time for filing pretrial motions or at any later time the court sets, and must file a copy of the notice with the clerk.⁴⁵ The mechanics mirror the insanity notice already taught, including the court's power for good cause to allow late filing, grant additional trial-preparation time, or make other appropriate orders.⁴⁶ The difference lies in what sets the duty running. Rule 12.2(a) asks whether the defendant will assert insanity at the time of the offense, while Rule 12.2(b) asks whether the defendant will put an expert's account of a mental condition before the factfinder. That second duty is the expert mental-condition notice.

The two duties are separate because mental-condition evidence can matter to a case even when no one claims insanity. Every offense requires some mental state, meaning the intent, knowledge, or similar awareness that the definition of the crime demands, and expert testimony about a mental condition can cast doubt on whether the defendant had it. In {{case_placeholder}} the Court described this first route: a State may let a defendant offer evidence of mental disease or incapacity for what it shows about whether the government has proved the required mental state, and the Court's illustration was a defendant who believes all blond people are robots and therefore could not have intended to kill a person when he shot a man with blond hair.⁴⁷ That evidence works by weakening the government's proof of an element, whereas an insanity defense operates after the elements are proved and excuses the defendant anyway.⁴⁸ Rule 12.2 reaches both routes. In United States v. Pohlot the Third Circuit recounted the Advisory Committee's statement that the rule is designed to require pretrial notice of an intent either to rely on insanity or to introduce expert testimony of mental disease or defect on the theory that the condition is inconsistent with the mental state the offense requires.⁴⁹ United States v. Bartlett likewise reproduces the rule's two subdivisions side by side, one for insanity and one for expert testimony bearing on guilt.⁵⁰

The reason for a second notice follows from what the government can do with an expert it has not seen coming. An expert opinion about a mental condition usually rests on interviews, testing, and records, and a prosecutor cannot answer that kind of opinion through cross-examination alone. The government needs time to retain its own examiner, to move for a court-ordered examination, and to collect the underlying records, and the notice is what starts that preparation.⁵¹ A notice rule limited to the insanity label would also leave an obvious gap. A defendant could skip the label, call the same psychiatrist to say that a condition prevented the required intent, and surprise the prosecution with an opinion that is just as hard to rebut. Rule 12.2(b) closes that gap by attaching the duty to the evidence. As with the insanity notice, the duty is automatic, so the government never has to ask for it first.⁵²

The rule's second trigger, expert evidence on the issue of punishment in a capital case, follows the same logic. A defendant who faces a possible death sentence and plans to offer expert evidence of a mental condition on that question must give the same written notice, because the government needs the same chance to examine and respond.⁵³ Rule 12.2 attaches its own procedures for handling examination results in capital cases, and this chapter treats the capital branch only as a second trigger for notice.

Exam Analysis Steps

Because the two notice duties have different triggers, the surest way to run them is to test each trigger on its own rather than to ask a general question about mental-health evidence. The steps are these:

Ask whether the defendant intends to introduce expert evidence, meaning opinion testimony from a witness qualified by specialized training, since lay testimony alone does not trigger the expert notice.
Ask whether the expert's subject is a mental disease or defect or any other mental condition of the defendant.
Ask whether the evidence bears on the issue of guilt, such as whether the defendant could form the required mental state, or on the issue of punishment in a capital case.
If all three answers are yes, confirm that the defendant gave written notice to an attorney for the government within the pretrial-motion time or a later time the court set, and filed a copy with the clerk.
Separately ask whether the defendant also intends to assert insanity at the time of the offense, because that triggers its own notice under Rule 12.2(a).
If any required notice is missing, ask whether the court has found good cause to allow late notice, grant more preparation time, or make another appropriate order.

The fifth step is the one that produces the rule's characteristic result: a defendant may owe the insanity notice, the expert notice, or both. An insanity defense supported only by lay witnesses would call for the first alone, while expert testimony on intent in a case with no insanity claim would call for the second alone. Because an insanity defense ordinarily rests on expert proof, a defendant who raises it will often owe both. Skipping a required notice has a price, since a failure to give it can result in exclusion of the expert's testimony, a consequence taken up in the sanctions section below.⁵⁴

Hypothetical Illustration

A defendant charged with fraud does not claim insanity but plans to call a psychiatrist to testify that a mental condition kept him from forming the intent to defraud. No insanity notice is due, because no insanity defense is asserted, but he must give the written expert notice to an attorney for the government and file a copy with the clerk on the pretrial-motion schedule.⁵⁵

Change the evidence. A second defendant is charged with arson and defends on mistaken identity. The only witness who touches on mental matters is a neighbor who will say the defendant seemed forgetful. The neighbor is a lay witness and no expert mental-condition evidence is offered, so the expert notice is not triggered, and since no insanity is asserted, the insanity notice is not triggered either.⁵⁶

A third defendant asserts insanity at the time of the offense and will call a psychiatrist to describe a mental disease. She owes the insanity notice because she will assert the defense, and she also owes the expert notice because she will introduce expert evidence of a mental disease bearing on guilt.⁵⁷

The first two defendants differ in a single fact, whether an expert will testify about a mental condition, and that fact alone decides whether Rule 12.2(b) applies. The third shows that the two notices can run together. The error to avoid on an exam stem is treating every mental-health expert as an insanity defense, because a psychiatrist offered to negate intent triggers the expert notice while leaving the insanity notice untouched. The reverse error is to assume that one filing serves both purposes, since each notice has its own trigger and each must be satisfied on its own terms.⁵⁸

Sanctions and Withdrawal

Rule 12.2 would accomplish little if a defendant could skip its notice and examination duties and still put the same mental-health proof before the jury, so the rule attaches consequences to noncompliance. Those consequences come from two places. Subdivision (a) states its own forfeiture for a missed insanity notice, and subdivision (d) collects the sanctions for the remaining failures: a missed expert notice, a refused examination, and a missed disclosure of the defense expert's results.⁶⁰ A third provision, subdivision (e), runs in the defendant's favor and protects a notice that the defendant later withdraws. Each provision has its own reason, and those reasons explain why the rule treats a defendant who breaks a duty so differently from one who merely changes strategy.

The insanity notice carries the most direct sanction. A defendant who fails to give the Rule 12.2(a) notice cannot rely on an insanity defense, and the rule writes that result into its own text instead of leaving it to the court's choice in each case.⁶¹ The reason is practical. The defense almost always rests on expert testimony about a mental disease, and the notice is what lets the government retain its own examiner and seek a court-ordered examination before trial. A defendant who withholds the notice denies the government that preparation, and barring the defense removes the surprise at its source. The one softening is the good-cause provision taught earlier, which lets the court accept a late notice, so a defendant with a real reason for delay still has a path back to the defense.

Rule 12.2(d)(1) governs expert mental-condition evidence, and it is framed differently. The court may exclude any expert evidence from the defendant on the issue of mental disease, mental defect, or any other mental condition bearing on guilt, or on punishment in a capital case, if the defendant fails to give the Rule 12.2(b) notice or fails to submit to an examination the court ordered under Rule 12.2(c).⁶² Two features of that text carry the exam points. The verb is permissive, so exclusion is a power the judge may exercise after looking at the circumstances and does not follow automatically from the failure. The target is also narrow: the sanction reaches the defendant's expert evidence on mental condition, which is the proof the government was denied the chance to test, and by its terms it does not reach lay witnesses or the government's own evidence.

A third route to exclusion concerns what the defendant must hand over after the government's examination. Rule 12.2(d)(2) lets the court exclude any expert evidence for which the defendant has failed to comply with the disclosure requirement of Rule 12.2(c)(3), the duty to disclose the results and reports of the defense expert's examination.⁶³ The three triggers protect one interest. An expert opinion about a mental condition rests on interviews, testing, and records that cross-examination cannot easily reach, so the government needs advance warning through the notice, access to the defendant through the examination, and the defense expert's findings through the disclosure.⁶⁴ If a defendant could present an expert while refusing any of these, the trial would become a contest between a prepared defense expert and a prosecutor who has no means of testing the opinion. Exclusion answers that harm directly, because it withdraws the one thing the government could not test. The alibi notice rule follows the same design, since the court may exclude the testimony of an undisclosed alibi witness but may not exclude the defendant's own testimony.⁶⁵

Exam Analysis Steps

Because each failure draws its own sanction, the surest way to run a problem is to identify the missed duty first and then apply the consequence attached to it. The steps are these:

Identify which duty the defendant failed to perform: the insanity notice, the expert mental-condition notice, submission to an ordered examination, or disclosure of the defense expert's results and reports.
If the missed duty is the insanity notice, apply the rule's own forfeiture, under which the defendant cannot rely on the insanity defense unless the court allows a late filing for good cause.
If the missed duty is the expert notice, the ordered examination, or the expert disclosure, ask whether the defendant is offering expert evidence on a mental condition, because that is the evidence the court may exclude.
Treat exclusion in the third step as a discretionary power, since the rule says the court may exclude and does not say it must.

The two defendants fail different duties and face the same available sanction, which shows that exclusion under subdivision (d) attaches to the defendant's expert evidence whichever duty was missed. Students lose this issue most often by treating exclusion as automatic, when the rule gives the judge a power that depends on the circumstances. A second slip is to apply the subdivision (d) language to the insanity notice, which has its own forfeiture stated in subdivision (a).

Withdrawal is the counterpart to sanctions, and it rests on a different premise: the defendant has broken no duty but has changed course. A defendant who gives notice under Rule 12.2(a) or (b) and later abandons the intention is protected, because evidence of that intention is not, in any civil or criminal proceeding, admissible against the person who gave the notice.⁶⁹ The protection covers either kind of notice, and its reach across any civil or criminal proceeding means the prosecution cannot use the withdrawn notice at trial, at sentencing, or in a later civil action against the same person.

The reason lies in how notice rules were justified. In Williams v. Florida the Supreme Court upheld a pretrial notice-of-alibi rule on the theory that it compelled only an acceleration of the timing of a disclosure the defendant planned to make at trial anyway.⁷⁰ That theory assumes the defense will actually be used. When the defendant abandons it, the notice records only a plan that was never carried out, and letting the prosecution treat that plan as evidence, for example as a sign that the defendant privately feared the facts, would punish the defendant for an early disclosure the rule itself compelled. The incentive problem is just as concrete. A notice is due at the pretrial deadline, often before the defense has finished investigating, so a defendant who could not safely retreat from a notice would hesitate to give one and would lose the chance to preserve the option. The federal notice rules therefore let a defendant withdraw a defense and bar the prosecutor from referring to the change in strategy.⁷¹

The protection has a limit that follows from its wording. It concerns evidence of the withdrawn intention, and it does not make the underlying facts of the case inadmissible. The prosecution remains free to prove what happened through ordinary evidence, and what it cannot do is show the factfinder that the defendant once planned the defense. Statements made during a court-ordered examination are governed by a separate protection taught later in this chapter.

The withdrawal rule and the sanctions rule fit together. A defendant who fails to comply loses the evidence the government could not test, while a defendant who gives notice and then reconsiders loses nothing, so the pretrial notice stays a safe step for a defendant who is still deciding on a theory.