Whenever an electronic camera (a digital camera or an analog camera with any electronic components, such as a flash) takes a picture, it must also emit a unique radio beep announcing it is taking a picture. Video cameras must emit a continuous radio tone. Also sound recorders.
A person can wear a monitor so they can know when they might have been photographed.
If a person fears being photographed by a camera with a telescopic lens, they can wear a giant antenna to detect the distant radio beep.
Certainly "bad guys" may get a hold of illegal cameras. But if confronted with a photograph of yourself from an illegal camera (which you can determine by examining your monitor) you have leverage back that the photographer was using an illegal camera.
Radio beepers are extremely cheap. Digital cameras may already emit a radio beep as a side-effect of normal operation, so make that one of the possible legally required emission, and those cameras may continued to be used unmodified legally.
Radio-less cameras may be operated with written permission of the subject.
But I don't like this idea. It stinks of Defective By Design. It assumes anyone who wants to covertly photograph or film something is up to no good, while exposing something or someone might be good for society.
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