Gee, better keep kiddie porn off your computer then.
Sorry, my sympathy levels are kind of low for that sort of thing, and if you practice any reasonable amount of PERSEC/OPSEC on your PC, then you should know better once you hand a computer device over to any sort of commercial technician.
As for Tattoos, they tell a story, and cops want the stories. That's why everyone plays that game. It's a no brainer intelligence resource. Part of the reason I don't get that shit put on me. I have been tempted to, but never got around to it.