What are the advantages of CCT surveillance ?

When someone see a CCT camera, the would think twice before doing any illegal things like robbing your house or stealing things from  your shop.It can also help the police in investigations if your house is located near a crime scene.CCT camera can also be used at homes to monitor the activities of your maid, for example to see if the maid is doing the housework while you are away at work or ill-treating your child.These cameras can also be used to track suspects in streets.It is also known that the CCT surveillance has saved shopkeepers tons of money in the past few years in america.