BANDIT12,
Obviously we'll never be entirely sure about the intricacies of the BL case, so perhaps a better example than the one given by SASLess would be the fact the Police regularly manage to hunt down pedophiles on chat rooms and forums who no doubt go to great lengths to attempt to hide their trail.
Another example would be members of "Anonymous" who carried out various high-profile mischievous internet acts. So they were evidently quite technically competent and did their best to hide their trail, however in the end they eventually pissed off the FBI enough to put some of their manpower who managed to track down some of the high-level culprits which then lead them to the rest of the gang after some questioning.
Last edited by mixture; 29th Dec 2012 at 15:37.