This Karr Still Doesn't Drive Right

First he got a free plane ride home from Thailand thanks to a questionable "confession" to JonBenet Ramsey's murder. Now, could John Mark Karr get a little more free stuff from the Santa Rosa, California District Attorney?
The DA's office disclosed that Karr's PC is missing. Originally seized in 2001 and allegedly containing kiddie porn images, the machine may have been inadvertently discarded during an office move, according to one media account. On Sept. 20th the county sheriff told the AP that a two-week search for the computer came up empty.
Both the sheriff and an Assistant District Attorney said the evidence had been copied and documented and the original device was not needed.
Karr has rejected a plea bargain that would have allowed him no imprisonment in return for time already served.
In California can insanity be a defense to misdemeanor child pornography possession charges?