I’ve been through that checkpoint many times. You slow down as you pull up to the checkpoint, roll down your window, they look at you and wave you on. Was there something about this Pastor that seemed suspicious? I doubt it. Maybe they have some sort of system like the TSA at airports where they have to pull someone out of the line for a more thorough search just because.
He was in a rental car, and the dog allegedly detected traces of drugs. Probably previous users of the vehicle had dope in there.