For over a decade, under multiple administrations, the U.S. government had a secret agreement with the ruthless Mexican Sinaloa drug cartel that allowed it to operate with impunity, an in-depth investigation by a leading Mexican newspaper confirmed this week. In exchange for information and assistance in quashing competing criminal syndicates, the Bush and Obama administrations let the Sinaloa cartel import tons of drugs into the United States while wiping out Sinaloa competitors and ensuring that its leaders would not be prosecuted for their long list of major crimes. Other revelations also point strongly to massive but clandestine U.S. government involvement in drug trafficking.