Afleitch, this is the current system:
AG: "We are prosecuting ____ because we believe this poster might have a sock."
Court: "Well why do you think this? What is your evidence?"
AG: "Because we saw the IP addresses, they're clear as day!"
Court: "Well you can't introduce IPs as evidence without a warrant."
AG: "Then I request a search warrant for the IP address."
Court: "Probable cause?"
AG: "How could I possibly obtain probable cause without a flat-out admission of guilt! There's no way to get probable cause!"
Court: "Then you cannot post the IP address."
AG: "But we know they match!!"
Court: "Case dismissed."
In other words, the current system sucks.
Presecution is just powerless in front of trolling and sockpuppeting