Customs and Border Protection agent Raimundo Borjas pleaded guilty to federal money-laundering charges Friday. Borjas was arrested in March 2013 for laundering $61,600 for an unknown person in the Mexican city of Agua Prieta in the state of Sonora, a region controlled by the Sinaloa drug cartel. That sum may be only a small part of a scheme that spanned several years of Borjas’s tenure at the CBP. Borjas will be sentenced Oct. 16. According to an analysis by the Center for Investigative Reporting, at least six other CBP agents have been arrested on money-laundering charges since 2004.