I know in the UK the law is a little weird, like it's illegal to sell or import detectors, but they are legal to use (despite the police pretending otherwise). However, detectors in and of themselves are not a whole lot of use here because of the vast array of speed measuring devices used, many of which do not use radar. It certainly seems that mobile units have replaced radar with laser.
But given the lies that have been told that speed cameras are all about safety rather than revenue, it's pretty difficult to argue against devices that tell the driver when they are coming up to cameras. After all, if a camera has been placed in order to slow people down at an accident black spot, then surely nothing can be safer than ensuring the driver knows they are entering a dangerous area, and need to check their speed and their surroundings? There's no safety benefit if the driver only knows he should slow down after he's through the black spot and been hit with a fine.
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