This wouldnt be possible in the US, the police don't have the authority to override federal legislation. The FCC has historically been extremely agressive and s

This wouldnt be possible in the US, the police don't have the authority to override federal legislation. The FCC has historically been extremely agressive and successful in prosecuting use of jamming devices. I think it's more likely that stingrays would be used to inventory who is at a protest etc and put people on a list for individual targeting.