Exactly. If there can be a camera at every traffic light, there can be one in every room and hallway of a prison. Oh, but wait. There is no revenue to be gained from that.
The government will save a lot of money if we execute prisoners decades before they're due out of jail. We'll need to modify things a bit, if there's evidence and it's right there on the videotape, then it should be easy to execute a prisoner for raping someone in jail.