Facebook is serious about real people using real names on its service.

After initially cracking down on drag queens, the social network is going after the U.S. Drug Enforcement Agency for using fake profiles.

It wants the DEA to know that it is not okay to create fake profile pages, even as part of ongoing investigations.

Facebook’s chief security officer sent a letter to the DEA yesterday saying that the agency is required to follow the same rules of honesty on Facebook as the rest of us, according to the AP.

That’s in the wake of an operation in which the DEA apparently created a fake profile page for a suspect, Sondra Arquiett. After arresting Arquiett in 2010, an agent created the fake profile in order to communicate with other suspects, probably hoping to catch them saying something incriminating. Arquiett subsequently sued the DEA, and is seeking $250,000 in damages.

Facebook isn’t…