In an open letter released today, eight former heads of the Drug Enforcement Administration, four former drug czars and assorted anti-drug groups urge the Senate Judiciary Committee, which is scheduled to hear testimony from Attorney General Eric Holder tomorrow, to grill him about why he is not stopping Colorado and Washington from legalizing marijuana. Their letter asked, "What is being done to honor our international drug control treaty obligations, which require the United States as a nation to enforce the law prohibiting the distribution, sale and cultivation of marijuana?"