In an insanity defense, the defendant admits the action but asserts a lack of culpability based on mental illness. If someone might have been insane at the time they committed the offense, a Frisco mental health lawyer can request testing prior to pleading insane.A person does not really plead insanity. If they are truly mentally incompetent their attorneys will have to represent their interests in court. Temporary insanity is a defense that can be used when the defendant believes they shouldn't be held criminally liable for their actions. Many people have heard about the insanity defense – the verdict known as Not Guilty By Reason of Insanity. But what does this verdict actually mean? Pleading insanity can be a complicated endeavor, as there are multiple ways in which the court might evaluate your claims. The below answer is incorrect - Yes you can represent yourself and put forward an insanity plea. Something more is evident.