[Fiction] An Unwelcome Visitor

[LilFluff]

I Am Not A Lawyer... but my understanding is that in the US, for most people who invoke the insanity defense it is very, very far from being a Walk Away Free card. Instead it is a, Congratulations You Get Involuntary Psychological Treatment Until Cured card. With an emphasis on the word until. IIRC I recall reading that on average such terms lasted about twice as long as the resulting jail time from a criminal conviction. Sure it's time in a mental facility rather than prison, but you are still there involuntarily and not allowed to leave. 

And the insanity plea is separate from determining competency to stand trial. Which can also potentially result in your being committed to an institution and treatment aimed at bringing you back to competence (whereupon you get to go on trial).

According to A Case of Insanity US States have started adding Guilty But Mentally Ill as a verdict option, where you are committed to an institution for treatment - and should you ever be deemed sane you then serve out the sentence for the crime. A short of Insanity Plea-Lite where the jury decodes that yes you are mentally ill, but not to such a degree as to absolve you of guilt. 
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Will the transhumanist future have catgirls? Does Japan still exist? Well, there is your answer.