Cops used to pull over people going north on 59 in Texas, that had the KLOL runaway radio stickers on their cars, find things wrong with the vehicles, etc.
(Around Livingston, IIRC).
In Louisiana, they pull over people going down I-10, back to Texas, thinking they'll have gambling winnings from the casinos.
CAF is not constitutional, to be sure.
Flimsy excuses are used routinely to get extra money they wouldn't be entitled to otherwise.