Eight former Drug Enforcement Administration chiefs warned the federal government that time is running out to nullify Colorado and Washington's new laws legalizing recreational marijuana use, and a United Nations agency also urged challenges to the measures it says violate international treaties. The former DEA chiefs criticized Barack Obama's administration for moving too slowly to file a lawsuit that would force the states to rescind the legislation. (Author, overseer of Washington pot law downplay ex-DEA chiefs’ war on weed)