They still do.... detector vans still scour neighbourhoods counting how many TVs you have in your house and reference to how many TVs you are licensed to own.
But really.... come on now... Do any of you REALLY think that today's police officers are so underworked and bored that they're driving around listening for IF's ???!!! Have the days of fighting crime become so mundane and redundant?! The last time I looked, they had a few more important matters to investigate, like who broke into my car and stole 74 cents from my drink holder. Those bastards are still at large, and I want the cops to do more finding and less caring about some schmuck and his scanner.
Not only is it way beyond the capabilities of most people to even be AWARE of such things, car-based scanners are legal in most states and provinces.
Not all cops are such enormously huge radio/scanner geeks that they are able to direction-find oscillator frequencies of your scanner. If scanners aren't illegal to have in your car in your state, then a cop isn't going to give two $hits if you have one in your car, especially if it's turned off when he pulls you over. Doing the bonehead move of having it blasting on his frequency when he pulls you over, well damn man... you deserve to get in trouble.