U.S. Customs and Border Protection officers Farlis Almonte and Ricardo Rodriguez were assigned to immigration inspection booths at the San Ysidro Port of Entry. They were charged after investigators found phone evidence showing they had exchanged messages with human traffickers in Mexico and discovered unexplained cash deposits into their bank accounts, according to a criminal complaint unsealed Thursday.

Surveillance video showed at least one instance in which a vehicle with a driver and a passenger stopped at a checkpoint but only the driver was documented as having entered the country, prosecutors said.

Prosecutors said the officers waved dozens of vehicles carrying people without documents. They said both men were paid thousands for each vehicle they waved through.