Matching Evidence to Purpose

Matching Evidence to Purpose

The same psychiatric testimony can be offered for three different jobs in a criminal case, and each job carries its own rule, its own burden, and its own result. A diagnosis of paranoid schizophrenia, for instance, may be offered to excuse the defendant altogether, to show that the prosecution failed to prove a required state of mind, or to ask a sentencer for imprisonment instead of death. The earlier sections taught each use on its own, and this section teaches the sorting move that comes first on an exam: asking what the proponent wants the evidence to accomplish. Students lose this issue when they let the diagnosis organize the answer, because the job the evidence is doing decides which rule applies, and one expert in one prosecution can appear in all three roles.

Each track answers a different question, which is why the Model Penal Code keeps them apart. The three compare most easily on the question asked, the burden, and the consequence of success.

• Insanity (§ 4.01 and § 4.03(1)). The question is whether mental disease or defect excludes the defendant's responsibility for conduct the State has already proved to be an offense, and the Code makes that an affirmative defense.¹ Because an affirmative defense of this kind negates no element, the Constitution does not require the State to disprove it beyond a reasonable doubt, and the burden of proving it may fall on the defendant.² Success produces a verdict of not guilty by reason of insanity and, usually, commitment of the defendant.³
• Mens rea negation (§ 4.02(1)). The question is whether the evidence is relevant to proving that the defendant did or did not have a state of mind that is an element of the offense, and the Code treats it like any other relevant evidence on that issue.⁴ The prosecution keeps its burden throughout, because it must still prove the required mental state beyond a reasonable doubt whatever the experts say.⁵ Success means acquittal of the charged offense, although conviction of a lesser offense may remain possible.⁶
• Capital sentencing mitigation (§ 4.02(2)). The question arises only after conviction, and only where the jury or the court is authorized to determine or recommend death or imprisonment: whether evidence that mental disease or defect impaired the capacity to appreciate wrongfulness or to conform conduct should favor a sentence of imprisonment.⁷ The conviction stands, and the evidence bears only on how the sentencer chooses between death and imprisonment.⁸

Keeping the tracks apart protects the burden and the result in each. If mental-disease evidence could reach the jury only through the insanity defense, a defendant whose illness left a required intent absent would have to carry the burden of an affirmative defense on a matter the prosecution must prove, and success would bring an insanity verdict with its commitment consequences instead of an acquittal. Jurisdictions that reject partial responsibility usually proceed from that assumption, treating insanity as all-or-nothing, so that a defendant who fails the insanity test is taken to have had the required mental state.⁹ The two questions differ: insanity asks whether a defendant who committed the offense should be excused, while the mens rea inquiry asks whether the offense, with its mental element, was committed at all. The Code's drafters accepted the acquittal that can follow, reasoning that public safety could be protected through involuntary civil commitment.¹⁰ Procedure follows the same split. Notice and special-plea steps required only to preserve insanity do not bar mens rea evidence, and in a bifurcated trial that evidence belongs at the guilt stage only.¹¹

Working the Hector Facts

The Hector problem puts all three tracks into one prosecution. Hector, who has paranoid schizophrenia, shot and killed a uniformed officer who arrived in a patrol car with its lights flashing after a neighbor complained about extremely loud music from Hector's house, and he is charged with intentionally killing a police officer in the line of duty, with the death penalty sought.¹² The defense psychiatrist would testify that Hector was psychotic and believed the victim was an alien disguised as a police officer about to kill him, and that people with this illness often play music loudly to drown out voices, while the prosecutor answers that a state statute confines the testimony to insanity and offers a witness who heard Hector say he wanted to kill police officers, arguing the music was a lure.¹³

On the mens rea track, the offense charged requires an intent to kill a police officer, so testimony that Hector believed the person at the door was an alien goes straight to an element. The Texas decision in Williams v. State describes a parallel case, Ruffin, in which expert testimony that delusions led a defendant to believe he was shooting at Muslims rather than at police officers was held clearly relevant to whether he intended to shoot at police officers.¹⁴ Under the Code's relevance standard, Hector's psychiatrist may therefore testify on mens rea without any insanity plea.¹⁵ The prosecutor's statute rests on the channeling approach covered earlier in this chapter, so whether it displaces the Code's rule depends on the jurisdiction and on the constitutional limits already taught. The prosecutor's witness shows what the jury would then decide, which is a contested question of fact about intent that the State must resolve in its favor beyond a reasonable doubt.¹⁶

The other two tracks run alongside. The same delusion could support an insanity defense, in which it is offered to excuse a killing even if intent was present, and that use would carry the burden and the commitment consequence of an affirmative defense.¹⁷ Because death is sought, a conviction would also bring a sentencing proceeding at which the jury or the court may determine death, and impairment evidence meeting § 4.02(2) would be admissible in favor of imprisonment even if the guilt-phase evidence had failed to persuade.¹⁸

The harder sorting question is whether a given opinion negates intent or only explains it. In Jackson, as the Texas court describes it, a defendant with paranoid schizophrenia and bipolar disorder killed his brother after a fight, and evidence that he was so paranoid he thought his brother was out to get him presented an excuse and did not negate the intent to kill.¹⁹ Mays likewise treated paranoia that led a defendant to believe officers had mistreated him as going to motive, and so to mitigation in punishment rather than to culpability.²⁰ What separates Ruffin from those two is what the delusion did. In Ruffin it changed what the defendant believed he was shooting at, which is an element of the offense charged, while in Jackson and Mays it supplied a reason for a killing the defendant understood and intended. The Texas court draws the line strictly, requiring the evidence to show the defendant was prevented from forming the intent and not merely to supply an excuse.²¹ The Code asks the broader question of relevance, but the lesson transfers: testimony about what the defendant believed or intended addresses the element, while testimony about why the defendant chose to act addresses excuse or mitigation.

Working the Bertrand Problem

The Bertrand problem presents the same sorting task with a prosecution objection that picks the wrong track. Bertrand's former wife, Lisu, has divorced him and he wants to reconcile; after many unanswered calls he arrives at her home unannounced, the conversation becomes a fight in which she calls him a loser, incompetent, and sexually inadequate, and he grabs her, with violence that leaves her hospitalized in critical condition.²² He is charged with attempted murder and suffers from minimal brain dysfunction with an explosive personality disorder with paranoid features, a biochemical imbalance that keeps him from controlling his emotional impulses in stressful situations, and the prosecution moves to exclude his psychiatrist as irrelevant to legal insanity or to any other issue.²³

The motion assumes that insanity is the only door, and the evidence track shows the mistake. Under the Code's approach, expert testimony about Bertrand's mental condition is admissible if it is relevant to whether he had the intent attempted murder requires, which is the question asked of any other evidence.²⁴ The motion therefore fails as framed, and the open issue is what the psychiatrist can actually say about his state of mind. That issue is best treated as issue-spotting, because the facts do not settle whether the opinion reaches intent or only explains why the insults enraged him. Because the described disorder concerns impulse control, the same testimony may also be offered for insanity if the jurisdiction's standard reaches a lack of capacity to control conduct, and in that role it supports an affirmative defense that Bertrand must raise.²⁵ The sentencing track is absent, since § 4.02(2) applies only where the jury or the court is authorized to determine or recommend death, and nothing in the facts as described suggests that death is an available sentence.²⁶

Change one fact, and the answer moves outside the three tracks. If Bertrand's rage comes from drunkenness instead of brain dysfunction, the evidence shows intoxication and not mental disease or defect, so intoxication doctrine decides whether it comes in.²⁷ That doctrine varies by jurisdiction and is taught separately. Many jurisdictions admit intoxication evidence only on specific-intent crimes, and the Code admits it when it negates an element while denying a special affirmative defense for self-induced intoxication.²⁸ Texas, for its part, forbids evidence of voluntary intoxication to rebut mens rea.²⁹ The boundary follows the evidence and not the substance: when prolonged drinking has produced organic brain damage, experts may classify that damage as a mental disease or defect, and insanity may then be available even though ordinary drunkenness would not support it.³⁰

Boundaries With Neighboring Doctrines

Two further doctrines resemble the tracks but are sorted differently, and the first is separated from them by asking whether the offered fact negates an element. In Patterson v. New York the defense of extreme emotional disturbance was designed for a defendant whose actions were caused by a mental infirmity short of insanity and who is therefore less culpable, yet New York made it an affirmative defense that the defendant proves by a preponderance of the evidence.³¹ The Court held that due process did not require the prosecution to disprove it, because it negates neither element of murder, which are intent to cause death and causing death, and so presents a separate issue on which the defendant may carry the burden.³² Smith v. United States states the general version of that test: unless an affirmative defense negates an element of the crime, the Government has no constitutional duty to overcome it beyond a reasonable doubt.³³ Mullaney v. Wilbur came out the other way on Maine's practice of presuming implied malice from an unlawful killing and requiring the defendant to prove heat of passion on sudden provocation, because a State may not presume an ingredient of the offense from proof of the other elements and thereby shift the burden to the defendant.³⁴ What separates the two decisions is whether the contested fact was an ingredient the State had to prove, and in Patterson nothing had been presumed against the defendant.³⁵ The label mitigating does not allocate the burden, but the question whether the fact negates an element does, and that same question separates mens rea evidence, which negates an element and leaves the burden with the State, from insanity, which excuses a proved offense.

The second neighbor is mental condition at the time of execution, which asks whether a sentence may be carried out and differs from insanity at the time of the offense and from evidence on mens rea. The footnotes in Ford v. Wainwright record that the common law condemned executing a person who has fallen mad and that many states by statute require suspension of the execution of a prisoner who meets the legal test for incompetence.³⁶ A stem that places the mental disorder at the execution stage therefore calls for none of the three tracks taught here.

The third step does the real work. The same disorder supports insanity only if the jurisdiction's insanity standard is met, supports mens rea only to the extent the testimony bears on a required state of mind, and supports mitigation only at a sentencing that satisfies the trigger. A proponent who cannot say which of the three outcomes the evidence supports has not yet identified a rule to apply.