Someone in a position to know told me this sort of thing was going on years ago. Specifically, agencies were putting people on the selectee list so they would be notified anytime a person of interest flew. They wouldn't prevent them from flying, just track their movement in a way the list wasn't intended to be used. That was before the batshit ruling on what is permitted in a border search. Now the abuse and harassment have moved to a higher level.
Feds Wait For Targets To Travel To Conduct Otherwise Illegal Searches, Documents Reveal