Mr. Biden [union event]: It's time for millionaires and billionaires, and big corporations, to pay their fair share. I can get that done, but I need you badly.
>U.S. Magistrate Judge Juan Alanis…dismissed the federal charges…ruled there was no probable cause in the case.
"Under what is typically referred to as the “border search exception” to the Fourth Amendment, federal officers may generally conduct warrantless searches of persons and items upon their entry into the United States without needing reasonable suspicion or probable cause of wrongdoing.
In United States v. Flores-Montano, the Supreme Court held that federal officers may search motor vehicles at the border without a warrant, reasonable suspicion, or probable cause"
https://www.law.cornell.edu/constitution-conan/amendment-4/searches-at-international-borders