Sure.
For example, take the Boston Marathon bombing. The best footage of that was from a department store camera pointing out on Massachusetts Avenue, and the police were darn glad that was there. Take the Vancouver Stanley Cup riots. There were citizens' videos. It came to an interesting privacy question actually, which the provincial commissioner had to rule on. Could the police take the licence database and run it up against photos of people looting stores to identify them?
She made a very wise decision. She said that they could submit the looting tape and a third party, the B.C. licensing people, could look at it, but then they needed a judge to unseal the data.
I think we need more oversight, because otherwise you can have a fishing expedition. I use an example in my book of a guy who parked in stall number 11, and he was put in a police computer as a known associate of a Mafioso. That was because the guy who parked in stall 12, unbeknownst to him, was a Mafia don. They would say good morning every day, so under surveillance he got put in there as a “known associate”.