Possibly because a lot of people have drugs or drug residue on them? I am in no way saying that cops never plant. Not even a little bit. I'm quite sure they do. But a lot of people do actually have drugs on them or in the car.
That leads to a whole different discussion of "If so many people do it, why is it still illegal?"
Not everything is a 'phone'. My very nice clock/radio/alarm receives AM and FM. I'd be pretty pissed off if I had to replace that (and all the other FM receivers in the house) with some new digital doodad.
So: Some Federal agency serves up some rules on whatever
Congress, who is actually in charge of passing laws, says, "Hey, wait a minute. Shouldn't we have looked at this first?"
This seems to be one of those "We have to pass it to see what's in it." type of deals.
I am NOT saying the Republicrats are all above board in what they're doing and why ($$$), but it does kind of seem to be in their bailiwick to investigate before things like this are approved or passed.