>>22448553oh and to answer the guys question about how "they know" a file a pic is CP.
NCMEC (nat center for missing and exploited children) maintains a database of verified content. (as in they know the victim, and the creator has been convicted)
for stuff thats not in the database it comes down to cops, lawyers, "experts", and judges looking at the pics/vids and deciding if they're real, and if they're underage.
There actually have been a few cases where "experts" said that there was no way the girl could be legal, and the defense had to bring in the actual porn star to show that she was in her 20's. little lupe had to show up for one of the more recent cases.