Not really, and it's nothing new. Customs authority on the borders clearly exceeds what would be constitutional anywhere else. It's why customs can tear apart a car without a warrant. It's been that way pretty much forever.
If you are believed to have crossed the border, US Customs and US Coast Guard can both do pretty much whatever they want. No warrants, no "probable cause", nuthin.
I'm not saying that's a bad thing, either. It's what makes the job possible. Any lesser powers and there would be no way for them to be effective at all.
“It’s why customs can tear apart a car without a warrant.”
Must be OK for DPS to do the same. 3 times during the 70’s in Waco,TX.
I’ve heard the Game Warden has the greatest latitude.