In particular there need to be proper safeguards against the many well-documented instances of misuse of these systems. Not least because there is absolutely no way that the public can know that it is being implemented. There should be full public disclosure of the location and coverage of all public CCTV cameras. People have a right to know when they are being subject to surveillance.
Full disclosure is bound to prove a more effective deterrent.
Control centres should have a clear public viewing area open at all times. The public have a right to see that these systems are not being abused. This step will be more effective in curtailing abuse than any other.