Every day, at sites across the United States, federal agents search container ships, trucks, cars, and aircraft entering the country. Now, increasingly, federal agents are also searching the electronic devices of the individuals entering the country – from citizens to permanent residents to tourists. See United States v. Cotterman, 709 F.3d 952, 956 (9th Cir. 2013) (en banc) (“Every day more than a million people cross American borders [and] . . . they carry with them laptop computers, iPhones, iPads, iPods, Kindles, Nooks, Surfaces, tablets, Blackberries, cell ...