Note that border searches of electronic devices are extremely rare overall. There were some statistics from CBP implying a base rate lower than 1 in 10,000 (I think lower than 1 in 100,000) border crossings.
I do know two people who have experienced them as a result of the government taking a personal interest in them, so it's certainly not impossible. However, it's not a common experience.
I've personally experienced searches of my suitcases about four times in about 100 U.S. border crossings (as a U.S. citizen, but the people performing or directing those searches generally didn't know my citizenship status), and zero electronic device searches.
I do know two people who have experienced them as a result of the government taking a personal interest in them, so it's certainly not impossible. However, it's not a common experience.
I've personally experienced searches of my suitcases about four times in about 100 U.S. border crossings (as a U.S. citizen, but the people performing or directing those searches generally didn't know my citizenship status), and zero electronic device searches.