From white-linen restaurants to K Street law firms, D.C. employers have found themselves on the front lines of defining marijuana legalization in the nation’s capital.

If your employee shows up bleary-eyed, can you do anything about it? And what protections will unions be able to offer?

A survey of D.C. business owners and union leaders in the week since the District legalized possession, use and home cultivation of marijuana shows these questions have begun to fuel a lively debate in workplaces.

Well, at least in most places. Construction firms with fleets of heavy machinery and hefty insurance bills have been among the first to reiterate their no-drug policies to employees. The FBI has also left a handy question-and-answer about marijuana use unchanged on its Web site. “Have you used marijuana at all within the last three years?” Those who answer yes, the FBI says, need not apply.

And while a D.C. Council committee tried to bring some clarity to the issue last week, some employers said it only added to the confusion. [Read more at The Washington Post]