Opening statements were set for Tuesday in the court martial of the only US officer charged with abusing prisoners in Iraq's Abu Ghraib prison. A military judge on Monday dismissed two of the most serious charges against Army Lt. Col. Steven L. Jordan, 51, a reservist, after a general who investigated the scandal acknowledged he had not read Jordan his rights before interviewing him. The action left Jordan still facing four counts and a possible 8 1/2 years in prison. Prosecutors on Monday amended one of those remaining counts, a cruelty and maltreatment charge, by narrowing its scope from three months to one day. Jordan, who has pleaded innocent, is the last of 12 Abu Ghraib defendants to be court-martialed.