Maj. Gen. Geoffrey D. Miller, former commander of the Guantanamo Bay detention center who helped set up interrogation practices at Abu Ghraib prison in Iraq, refuses to testify further about prisoner interrogations, citing his military Article 31 rights, which are similar to the Fifth Amendment right against self-incrimination. Miller’s decision to remain silent will affect court-martial proceedings for two soldiers accused of using dogs to terrorize prisoners at Abu Ghraib. He was implicated in a Guantanamo abuse case, but several investigations cleared him of wrongdoing related to the Abu Ghraib scandal.