Danbury Police say that during recent investigations, officers have seen faulty or poorly maintained Closed Circuit Television and surveillance systems. In many cases, police say the quality and functionality of the system can be the difference between solving or not solving a crime. They've put together some maintenance tips to help keep surveillance systems up an running. They include making sure there are no loose wires, no wear, tear or exposed wires and that there's a correct time stamp on monitors. The camera lens should also be clean, focused and positioned properly.