Six directors of the Office of National Drug Control Policy over the previous 3 administrations penned a cooperative op-ed Wednesday in opposition to California's Proposition 19 ballot proposal to legalize marijuana.

The editorial, written by Gil Kerlikowske, John Walters, Barry McCaffrey, Lee Brown, Bob Martinez and William Bennett -- that's every United States "drug czar," including the current one -- was published in the Los Angeles Times Wednesday, and argues primarily that social costs incurred by legalizing marijuana would outweigh the potential revenue streams gained by taxing drug sales.

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Why California should just say no to Prop. 19