I agree with admarlow, but it doesn't go nearly far enough. Why wait until a crime is committed. We need to pre-empt them to make the country properly safe.
I think we should have the right to access the medical records of people and look for things like anger management and violence issues, because these people are bound to be the criminals of tomorrow, and it's my civil right not to be attacked.
Also, we should be able to access people's Blockbuster accounts and library records see if they're seeing stuff we don't approve of, cause it's my civil right not to be attacked.
Cameras and microphones in everyone's houses would be useful. All disent could be immediately stamped out.
Actually, thinking about it we can't trust anyone, so I think everyone should be locked up and treated like a potential criminal. Everyone apart from me, obviously.