It's not a new tactic, but for some, it might be a surprising one: One of the ways the Denver Police Department has checked the identities of those faced with warrants for Occupy Denver is through online archival footage, including the average YouTube search. Previously anonymous protesters can be -- and have been -- easily identified through crowd and news coverage of weekend events. Depending on what they're wearing, not even Guy Fawkes masks can keep them anonymous.

"We can use that information from videos to help identify individuals suspected of criminal activity, and that's pretty significant," says Detective John White, a DPD spokesman. "I wouldn't say we use online searches frequently, but if our investigators believe there is some useful information on one of those YouTube videos that could be used to identity someone suspected of criminal activity, we do."

That's how Sean Driggers was caught, at least. Driggers was arrested on suspicion of felony assault on a police officer days after John Sexton had been taken in for the same investigation on the same day. (Sexton's charges have since been dropped.) Although the DPD repeatedly claimed that two felony assault cases had resulted from the October 29 demonstration, Driggers's full name wasn't released for a week before finally becoming public.