How To Detect An Hidden Camera In A Room

When you stay in an hotel, how do you know there is no room pinhole camera?

When you travel or take a business trip, and stay in a hotel or a guest house or room you could unknowingly be photographed. You can use this method to check your room:
*When you enter into the room, turn off the lights, and close the curtains, open your phone camera, do not turn the flash light on.
*Turn around the room with your cell phone. When a red dot is found, that means that a hidden web camera is installed. If no red dots,the room is ok.

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