Who bears the burden to prove lack of capacity due to mental disease or defect when using it as an affirmative defense?

Who bears the burden to prove lack of capacity due to mental disease or defect when using it as an affirmative defense?

• A. The defense.
• B. The prosecution.
• C. The judge.
• D. The defense attorney.

Answer: (A)

When a defendant uses insanity (lack of capacity due to mental disease or defect) as an affirmative defense, the responsibility to prove that lack of capacity rests on the defendant. This means the defense must present evidence—often including expert psychiatric testimony—to show the defendant was incapable of understanding the act or conforming to the law at the time of the offense, and to meet the applicable standard of proof (typically preponderance of the evidence, though some jurisdictions require clear and convincing proof). The prosecution still must prove all elements of the crime beyond a reasonable doubt, but they are not required to disprove the defense claim. The judge evaluates whether the defense has met the required standard, and the defense attorney is the advocate presenting and arguing the defense.

When a defendant uses insanity (lack of capacity due to mental disease or defect) as an affirmative defense, the responsibility to prove that lack of capacity rests on the defendant. This means the defense must present evidence—often including expert psychiatric testimony—to show the defendant was incapable of understanding the act or conforming to the law at the time of the offense, and to meet the applicable standard of proof (typically preponderance of the evidence, though some jurisdictions require clear and convincing proof). The prosecution still must prove all elements of the crime beyond a reasonable doubt, but they are not required to disprove the defense claim. The judge evaluates whether the defense has met the required standard, and the defense attorney is the advocate presenting and arguing the defense.