Border Patrol or Undercover Drug Cartels?

The job of the United Staates/ Mexican border patrol is to keep the people of their country safe and to stop illegal substances into or out of their country. Unfortunatly, some of the people on the border patrol of Mexico are being payed off by drug cartels to traffic illegal drugs into the U.S. How are we supposed to cut the drug supply in the U.S. if the people responsible for keeping the drugs out are the ones that are letting it in for money? This problem must be adressed if the supply of drugs in the U.S. is to drop. There should be a background check on the people that are hired to patrol the borders. The United States Border patrol as well as the Mexican troopers need to tighten up security and make sure that drugs do not get in.