Right out of "No Country for Old Men", Buzzfeed's got an excellent article on "Mano Negra", one of the Cartel's most notorious hitmen/Serial Killers. Which goes to prove, as with Bruce McArthur or Robert Pickton, that if you choose the right minority the police really aren't going to bother you.
What is scary is how ordinary he is, and his comment "True Evil has a face you know and a Voice you Trust".