And please note that you are now guilty of possession of child porn. The fact that you have/had an image on your computer is an AUTOMATIC CONVICTION should they choose to prosecute you and examine the hard disk for fragments. Your "story" about how it got there is irrelevant. Nice world, eh?

If that ever happened to me, I would print out some pictures of child porn and mail it to the prosecuting attorney. Then he would be guilty too.