State v. Wierson

Michelle Wierson was charged with vehicular homicide after allegedly speeding and causing a fatal crash. Two psychiatrists concluded she lacked the mental capacity to know right from wrong and was acting under a delusion at the time, so she gave notice she would plead not guilty by reason of insanity. Prosecutors wanted to tell the jury that Wierson had stopped taking some psychiatric medications weeks before the crash, arguing this showed she voluntarily brought on her own mental state. A trial court allowed that evidence, but the Court of Appeals of Georgia reversed, saying Georgia's insanity statutes say nothing about how a defendant's mental state came about. The Supreme Court of Georgia agreed that the evidence was not relevant to whether Wierson could use the insanity defense. It also revisited a 1982 case, Bailey v. State, which had created an unwritten exception denying the insanity defense to people who voluntarily caused their own delusions. The court held that Bailey was wrongly decided because it never actually interpreted the statute, and it overruled that exception.

Georgia's insanity-defense statutes contain no exception for defendants who voluntarily or intentionally brought about their own lack of mental capacity or delusional compulsion, so evidence of medication non-compliance is not relevant to whether the defense is available, and Bailey v. State's contrary judge-made exception is overruled.

The ruling means Georgia prosecutors can no longer defeat an insanity defense simply by showing a defendant stopped taking medication or otherwise contributed to their own mental state. It affects how insanity pleas are litigated statewide and removes a decades-old exception that had been used against defendants with mental illness.

Affirmed

1. The court read the plain text of the insanity-defense statutes (O.C.G.A. §§ 16-3-2 and 16-3-3), which ask only whether the defendant lacked mental capacity or suffered a delusional compulsion 'at the time' of the crime, with no mention of how that mental state arose.
2. Comparing these statutes to the neighboring voluntary-intoxication statute, which explicitly excludes voluntary intoxication as a defense, the court applied the principle that when one statute includes an exception and a similar nearby statute does not, the omission is presumed intentional.
3. The court traced Georgia's insanity-defense law back to 1817 and found that, historically, courts always focused only on the defendant's mental state at the time of the offense, never on whether the defendant caused that state voluntarily.
4. Turning to Bailey v. State, a 1982 decision that denied the delusional-compulsion defense to a schizophrenic man who ignored medical advice, the court concluded Bailey's holding, that the defense is unavailable to someone who voluntarily induced their own delusion, would control Wierson's case if left standing.
5. Applying stare decisis, the doctrine that courts should generally follow past precedent unless doing so causes more harm than good, the court found Bailey was 'unreasoned' because it never analyzed the statute's text and instead borrowed an exception from a different statute, making it a case ripe for overruling.
6. Because Bailey created no lasting reliance interests and had barely been cited in over forty years, the court overruled its holding and held the insanity defenses remain available regardless of how the defendant's mental state came about.

• insanity defense
• vehicular homicide
• medication non-compliance
• Bailey v. State overruled
• delusional compulsion