If you live in the District of Columbia or one of the 23 states that have legalized marijuana and you work for the federal government, think twice before lighting a joint.

Pot is still illegal for you.

New guidance Wednesday from the Office of Personnel Management is unambiguous and stern. Federal workforce rules remain unchanged for the roughly 4.1 million federal employees and military personnel across the United States. The U.S. government still considers marijuana an illegal drug, and possessing or using it is a crime.

“Heads of agencies are expected to advise their workforce that legislative changes by some states and the District of Columbia do not alter federal law, existing suitability criteria or Executive Branch policies regarding marijuana,” OPM Director Katherine Archuleta wrote in a memo posted on the agency’s Web site. [Read more at The Washington Post]