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The radar beam. hits oncoming cars, and is reï¬ected back. to the radar unit, which can calculate. speeds from those reï¬ections. Radar can be used from a police car. thatâs either stationary or moving, since. it does not require precise aiming to. clock traï¬c speeds. There are also hand-. held units that can be operated from a. car, motorcycle, or an oï¬cer standing at. the side of the road.
The police can identify criminals recorded with cameras. Through surveillance cameras, the police can both prevent crimes from happening and can quickly solve criminal cases with material evidence. In addition, surveillance cameras protect against property theft, and vandalism. It is very difficult to get away with stealing something if there are cameras filming you. Therefore, the thief will often get caught. Surveillance cameras will catch the thief before, or during the process of committing the crime. If no one is aware of the crime until after it has been committed, the surveillance footage is always a crucial piece of evidence during a police investigation. Surveillance cameras have, and will prevent many crimes. Some people may say that we should not have surveillance cameras in public places. They claim that they invade privacy. That is false. Why be out in public if you want privacy? Just stay at home. Surveillance cameras are meant to keep you and other property safe, not to stalk you.