Four south Texas police officers, including the son of a top cop advising the Department of Homeland Security (DHS) on border issues, were charged Thursday with accepting thousands of dollars in bribes to guard cartel cocaine shipments.

One of the officers arrested, 29-year-old Alexis Rigoberto Espinoza, is the son of Hidalgo Chief of Police Rodolfo Espinoza, according to south Texas newspaper The Monitor.

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Another one of the officers, 29-year-old Jonathan Treviño, is the son of Hidalgo County Sheriff Lupe Treviño. The elder Treviño also serves on the Southwest Border Task Force, a group established by DHS chief Janet Natpolitano in 2009 to advise her on border issues.

Two other officers, 28-year-old Fabian Rodriguez and 30-year-old Gerardo Duran, were reportedly members of the sheriff’s narcotics task force, nicknamed the “Panama Unit,” according to Government Security News. All four men were arrested on Wednesday.