This was sent to me as an email warning! If you do this nasty thing you will go to jail if caught. FYI

Do what?

 It won't work anyway.

The digital files created by the cameras are fed via internet connection to the company's servers at another location. Attempting to corrupt digital photo files via magnetism at the camera's location will be completely ineffective if only these piddling little inferior units are used. To damage the function of the camera itself would require something on the scale of a car-heaving juckyard electro-magnet.