Alternate names McNaughtan ? - ? Bio This delusional Scottish woodturner changed the course of the insanity defense when he was tried in 1843 for the murder of Edward Drummond, secretary to British Prime Minister Sir Robert Peel. M'Naghten test | M'Naughten rule | McNaughten Books, etc. Knowing Right from Wrong - The Insanity Defense of Daniel McNaughtan Movies Copycat Comments View the discussion thread.