A Providence man is being accused of impersonating a social worker while trying to sign out a female high school student. The Portsmouth Police Department says Armando Hernandez went to Portsmouth High School on October 13th and claimed he was a DCYF worker, but didn't have any identification. U.S. Marshals and state troopers arrested Hernandez this past Friday. He pleaded no contest to the charge of impersonating a public official in Newport District Court.