Ah, good question.
He pulled out of a WalMart in New Mexico without coming to a complete stop.
Then he looked nervous when pulled over. Allegedly appeared to be "clenching buttocks" when asked to step out of car.
Then, the officer got on the radio and heard from a colleague that the suspect had some previous drug related incident. Which the cop on the scene spun into "was caught with drugs up his butt".
The (uncertified) drug sniffing dog gave the signal, allegedly, on the guy's car seat.
Court gave search warrant for suspect's butt based on police officer's claim (unverified) of previously having hidden drugs up his butt.
2nd police officer's report makes no claim of previous incident being about drugs up butt.
The search was done in a different county (possibly outside jurisdiction of warrant) after hospital #1 refused to participate. Some of the search (colonoscopy at least) was performed after the valid time period of the warrant (rendering warrant invalid / expired?).
This is not an isolated incident.