The insanity defense tends to get attention in sensational high-profile cases: Ted Kaczynski, Lorena Bobbitt, and most notoriously, John Hinckley. But successful use of the insanity defense is rare, even for defendants who *are* profoundly mentally ill. Defendants are found not guilty by reason of insanity in just half of one percent of all felony cases. In part three of our series on jailing the mentally ill...John Biewen of MPR's American RadioWorks documentary unit takes an in-depth look at the case of one Minnesota man. The case illustrates the difficulties of claiming legal insanity.