By Kaye Burnet | News Editor The Allegheny County District Attorney’s office has dropped all charges against a Duquesne graduate student arrested in September for sexual assault after video surfaced that showed the student was somewhere else at the time of the attack, according to the office’s spokesman. Police arrested Rex Coughenour, 61, on Sept. 15 and accused him of attacking a pregnant woman. He … Continue reading Evidence clears DU student of assault