How could the UN make a ruling on that? As I recall, they've never been allowed to set foot in Gitmo, so their reports couldn't be based on anything more than hearsay.
The five U.N. investigators, who include Manfred Nowak, special rapporteur on torture, and Leila Zerrougui, chairperson of the U.N. Working Group on Arbitrary Detention, said the findings were based on interviews with past detainees, lawyers and replies to questions put to the U.S. government.
How is that for thorough & impartial investigating?
"Not allowed"..actually the UN declined the visit...