I work at petco...and we are definately allowed to admit where these mice and rats are going. We've never made people fill out forms. 90% of the mice and rats we sell are feeders...the only animals we're not allowed to sell as feeders are guinea pigs and gerbils. I've heard from one of our customers that we're the only people they can come to in the area, because if you get mice from petsmart or some other general pet stores...mice are given medicine for their own health as pets, that makes them really bad for snakes to ingest. Petco is a bit costly if you have many snakes.