"Just visit your local FBI field office and ask them." Uh, yeah, I'll head right over.
Anyhow, here's the thing, and I'm not trying to stir up any hornets nests here, but what about this, from the 2003 "Protect" act (look it up in Wikipedia)
-Prohibits drawings, sculptures, and pictures of such drawings and sculptures depicting minors in actions or situations that meet the (Miller test) of being obscene.