I remember the ads in old Car&Track and Road&Driver magazines at the doctor’s office. They always had a veneer of illegality to them, even in states where they were legal. Funny how something like Waze doesn’t. I wonder if it’s that Waze is just the technological equivalent to the oncoming driver flashing their brights at you.
There was also at least one recurring ad for a purported radar jammer. Either in the car magazines or the electronics ones. It might've been "sold in legal kit form".