Not Guilty by Reason of Insanity? What Is Required?

If someone is obsessive-compulsive, or takes Ritalin, or smokes a lot of marijuana, can not guilty by reason of insanity be a defense?  What if the person was intoxicated by alcohol or drugs when the offense was committed?  Is that not guilty by reason of insanity?  What is required to assert such a defense?  To read about this often considered defense, click on the following link .

http://www.greghillassociates.com/not-guilty-by-reason-of-insanity-what-is-required.html.