So the Red Cross has the right to examine every inch of where they're held.
As prisoners of war.
And, if the US is found to be mistreating them in any way, in accordance with the treaties which we have signed voluntarily as a nation, then those mistreating them, and those responsible for the oversight of the abusers, can be tried as war criminals.
Be careful what you wish for, indeed.
I daresay a treaty can't be signed with al Qaeda, since it's not a corporate entity. Afghanistan, maybe. That's where they were captured, after all.