“prove beyond a reasonable doubt that, even if the defendant suffered from a mental disease or defect at the time of the alleged offense, the defendant nonetheless retained the substantial capacity to appreciate the wrongfulness or criminality of their conduct and to conform their conduct to the requirements of the law.”

Massachusetts Court System · said date not stated · reported 2026-09-04

The state court system describes a second way prosecutors can prove criminal responsibility even if the defendant suffered from a mental disease or defect.