From the "But I Have Nothing To Hide" department:

"If a traveler's phone, tablet or computer ever gets searched at an airport, American border authorities could add data from their device to a massive database that can be accessed by thousands of government officials. US Customs and Border Protection (CBP) leaders have admitted to lawmakers in a briefing that its officials are adding information to a database from as many as 10,000 devices every year, The Washington Post reports.

Further, 2,700 CBP officers can access the database without a warrant and without having to record the purpose of their search. These details were revealed in a letter Senator Ron Wyden wrote to CBP Commissioner Chris Magnus, where the lawmaker also said that CBP keeps any information it takes from people's devices for 15 years."

https://www.engadget.com/us-border-forces-traveler-data-15-years-085106938.html