One of the off-duty police officers who was in Ben Roethlisberger's entourage on the night he allegedly sexually assaulted a 20-year old woman has just been banned from working for the Steelers quarterback.

TMZ has learned the Pennsylvania State Police has rescinded Trooper Edward Joyner's authorization to perform supplemental employment, which allowed him to work as a "driver/assistant" to Roethlisberger in an "off-duty" capacity.

In a release by the state police, Trooper Joyner had his contract revoked after an "initial review of the investigation conducted by the Georgia Bureau of Investigation."

The rescission documents, executed Monday, claim Joyner violated "the stipulations" of his employment approval and he "demean[ed] the image of the department."

Joyner wasn't the only off-duty cop rolling with Big Ben on the night of the alleged incident -- but so far, the other cop has not faced any disciplinary action.