My co-worker told me that some weeks ago he had a weird experience with the police with his motorbike at the maloja pass (canton of GR).
He said that there was road works or something so the speed limit signal went down from 80 to 40 km/h. now since he loves accelerating also in the other way (braking), he braked hard abruptly.
a few seconds later the police stopped him. my co-worker thought that it was a routine control since he didn't drive past the limit. he thought wrong: the officers were in bad mood and have shaken his bike down from the top to the bottom. they looked in every angle as if they were looking for something. my co-worker said that they used something like a scanner for this, but he couldn't remember what it looks like. when he told me that, i immediately thought about a radar detector detector.
after app. 10 minutes they let him go. when he asked what he did wrong, they said that they thought he used a radar detector because he braked that hard.
so be careful, RD users in GraubŁnden, i think the police there got new toys...