The hidden cameras are being installed at various public and semi public places like the restaurants, the discos, the universities, the colleges, the hospitals and many more places. Though they are being used by different people, but the motive behind its use is the same everywhere. They are being installed to observe the every action behind the purpose. A study says that over 25 million CCTV cameras are expected to be in action in the next few years. Hidden cams even they can be installed by the taxi drivers to keep a watch on the passengers traveling with them.