said by dragonfly:It certainly works with a large enough sample set of a user's online activities to form a psychological profile. People don't 'stumble' onto the same images using specific keywords in the search engine or requesting certain .torrent files.
Prosecuting the "demand" side doesn't really work. The drug war taught us that. Besides, if I stumble onto an awful website and accidentally download something illegal, I'm going to jail for life? That's ripe for abuse.