Borderline (1980)

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. If this villainous smuggler is going to be caught, Maynard is going to have to do the dirty work himself.