The U.S. Supreme Court today ruled that President Bush's plan to subject Guantanamo detainees to judgment by military commissions is unconstitutional.
Not only that, but the Court ruled that captured terrorists, including Al-Qaeda, have to be treated in accordance with the Geneva Convention rules for detained prisoners of war.
From SCOTUSblog (via AMERICAblog):
(T)he Court held that Common Article 3 of Geneva applies as a matter of treaty obligation to the conflict against Al Qaeda. That is the HUGE part of today's ruling. The commissions are the least of it. This basically resolves the debate about interrogation techniques, because Common Article 3 provides that detained persons "shall in all circumstances be treated humanely," and that "[t]o this end," certain specified acts "are and shall remain prohibited at any time and in any place whatsoever" --including "cruel treatment and torture," and "outrages upon personal dignity, in particular humiliating and degrading treatment." This standard, not limited to the restrictions of the due process clause, is much more restrictive than even the McCain Amendment...
This almost certainly means that the CIA's interrogation regime is unlawful, and indeed, that many techniques the Administration has been using, such as waterboarding and hypothermia (and others) violate the War Crimes Act (because violations of Common Article 3 are deemed war crimes).