Local cops spider P2P networks looking for IP addresses that are involved with trading child porn. There are LE communications networks / programs that allow them to seamlessly refer a case to its appropriate jurisdictions local law enforcement if they find someone out of their jurisdiction trading in CP. Most CP busts that involve under ~100 images are dealt with this way, the feds mostly go after ~100+. But the point is local law enforcement do attack CP traders and jurisdiction doesn't stop them. I wouldn't be at all surprised if they approach the online drug trade in the same exact way. https://en.wikipedia.org/wiki/Child_Exploitation_Tracking_System