When drivers drive through a red light, a red-light camera will take a picture of him and his license plate. Motorists generally hate them. Many feel the gadgets are designed to make money for a city, and not to catch bad-guys. However, two devices have just appeared that use similar technology to make red-light camera photos useless to police force. One of the gadgets can be bought now. The other is still raising money to get UL certification.