They are useful to a degree , but can lull you into a false sense of security.
They are good for fixed camera locations.
The are mildly useful for mobile locations (as in they tell you there may or may not be one there).
If you have one with a laser detector as used in mobiles and by plod hiding in bushes they are USELESS as by the time it detects the laser aimed at you, they've already got you.
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