The Washington Post is reporting a high-ranking US army official has invoked his right not to incriminate himself while testifying in the military tribunal of two soldiers accused of using dogs to intimidate detainees at the Abu Ghraib prison in Iraq. The decision by Maj. Gen. Geoffrey Miller — who helped set up interrogations at Abu Ghraib — comes shortly after Col. Thomas Pappas, the commanding officer at Abu Ghraib, accepted immunity from prosecution this week and was ordered to testify at an upcoming military trial. According to the Post, Col. Pappas, could be asked how abusive tactics emerged, who ordered their use and their possible connection to officials in Washington. Michael Ratner, president of the Center for Constitutional Rights, said: “It’s a steppingstone going up the chain of command, and that’s positive. It might demonstrate that it wasn’t just a few rotten apples.”