Borderline (1980)

"Somewhere along a thousand miles of barbed wire border, the American dream has become a nightmare."

Jeb Maynard is a patrolman guarding the U.S.-Mexican border, whose partner and buddy Scooter has just been murdered. Maynard knows that a smuggler of illegal aliens is responsible for Scooter's death, but the feds insist that drug dealers committed the crime.