Is cannabis (a.k.a. marijuana)* legal or illegal?
The answer is yes.
At present, cannabis is legal for medical use in 34 states and the District of Columbia. In 10 states and the District of Columbia, it is legal for recreational use. And yet it is illegal everywhere and for all purposes as far as the federal government is concerned. The Drug Enforcement Administration (DEA) continues to categorize it as a Schedule 1 drug, which means that it is perceived as having high potential for abuse. Furthermore, the Food and Drug Administration (FDA) has ascribed no accepted medical use to it, is not proceeding with any clinical trials, and offers no oversight for it.
Yet while governments may be confused, there's no need for your workplace to give your employees mixed messages.