The local Sheriff's dept got a "Super Cruiser" that was supposed to have that capability a couple of years back. I was giving a late friend of mine stoner sons a ride to the bus station and the super car pulled up beside us at a stoplight. They started going on about the thing, acting more paranoid than usual for those two. I said, "Let's see if works?" and started hollering "Ayatollah! Ayatollah!" ala the movie "Used Cars". I though the two of them were going to have a stroke. The cop didn't notice. Maybe the super car wasn't activated?
Nothing like screwing with young stoners. I once heard the two of them having a discussion of how smoking pot with seeds in it would make you sterile. I said, "If that was true, neither of you two would be here." Both of them are now married and breeding, the thought of it makes me wake up in a cold sweat some nights.