Eric Posner lists facts that make closing Gitmo difficult while Paul Cassell points to a paper by Professor Amos Guiora on how to try the detainees:
I suggest a hybrid "domestic terror court" that would allow for an in camera review of confidential intelligence information presented by the prosecutor and a representative of the intelligence services. A properly constituted domestic terror court – comprised of judges schooled in understanding intelligence reports and intelligence gathering procedures, and aware of the necessity of preserving constitutional rights-is the proper starting point in moving forward with post 9/11 terrorist prosecutions. The proposed hybrid paradigm will ensure both the state’s obligations to keep intelligence and matters of national security confidential as well as the defendant’s right to a fair trial.