Two Iraqis at the notorious Abu Ghraib prison were bitten by dogs as they were being handled by sergeants who were competing to see who could scare more detainees, a witness testified Tuesday. Pvt. Ivan L. “Chip” Frederick II — himself convicted of abusing inmates at the military prison — testified by phone in the Article 32 hearing, the military equivalent of a grand jury proceeding, for Sgts. Santos A. Cardona and Michael J. Smith. The Army had announced the hearing on Monday. Full Story