Bill Barr's Drug Bust

The attorney general got nothing but promises in return for handing back Mexico's former defense minister, accused of protecting a drug cartel

A deal with the Devil is better than no deal at all. 

That’s a time-tested maxim at the U.S. Drug Enforcement Administration, where agents routinely cultivate unsavory characters—criminal informants and sketchy local and foreign law enforcement partners—and use them to penetrate organized crime rings and reel in bigger fish. 

The problem comes when you le…