A drunken-driving charge has been dismissed against a Rhode Island federal prosecutor whose arrest sparked an internal investigation into whether police treated him favorably.

A Warwick judge agreed Monday to a city lawyer’s request to drop the charge against Assistant U.S. Attorney Gerard Sullivan.

Robert Sgroi says he made the recommendation partly because Sullivan admitted last week that there was enough evidence to prove he refused a chemical breath test when he was pulled over early on Thanksgiving morning. Sullivan has lost his driver’s license for seven months.

Warwick police say Sullivan mentioned several times that he was a federal prosecutor and knew their chief.

The chief has ordered an internal inquiry into why Sullivan was not initially charged with DUI.

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