insanity defense

A jury has found Aaron Ybarra guilty of first-degree murder in the killing of a Seattle Pacific University student and wounding of two other students…

Four states have no insanity defense. Advocates say that means seriously ill people can be executed where in other states they wouldn't be convicted at all, and it makes it harder to get treatment.

Having a serious mental diagnosis doesn't necessarily mean that juries will consider an insanity defense. Some states have changed their laws to exclude people with antisocial personality disorder.