To conduct a warrantless forensic search of a digital device at the border, do government agents need reasonable suspicion that the device contains digital contraband (as the Ninth Circuit requires), reasonable suspicion that the device contains evidence of a particular crime with a nexus to the purposes of the border search exception to the warrant requirement (as the Fourth Circuit requires), reasonable suspicion of any kind of criminal activity (which suffices in the Tenth Circuit), or no suspicion whatsoever (as the Eleventh Circuit permits)?

Whether government agents need reasonable suspicion to conduct a warrantless forensic search of a digital device at the border