He says intelligence sources and methods will become known,and Afghans who have helped American forces may now be in danger.

VOA: special.2010.07.31

Moreover, it appears likely that certain charges could not be presented in a civilian court because the proof that would have to be offered could, if publicly disclosed, compromise sources and methods of intelligence gathering.

CENTERFORSECURITYPOLICY: Civilian courts are no place to try terrorists

Mr. al-Arian got Candidate Bush to promise to prohibit the use of secret evidence, a practice law enforcement uses sparingly in deportation and criminal proceedings in order to protect intelligence sources and methods.

CENTERFORSECURITYPOLICY: Decision Brief No. 05-D 43 2005-08-29

Military commission trials have been used in most American wars, and their rules and procedures are designed around the need to protect intelligence sources and methods from revelation in open court.

WSJ: John Yoo: Obama Made a Rash Decision on Gitmo