According to a CBP press release from April, "in the first six months of FY17, CBP searched the electronic devices of 14,993 arriving international travelers, affecting 0.008 percent of the approximately 189.6 million travelers arriving to the United States."
The release goes on to show that this is nearly twice as frequent as the equivalent period last year.
The release goes on to show that this is nearly twice as frequent as the equivalent period last year.