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In page CIA black sites:

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There is little or no stated legal authority for the operation of black sites by the United States or the other countries believed to be involved. In fact, the specifics of the network of black sites remains controversial. The United Nations has begun to intervene in this aspect of black sites.[citation needed] A 2010 United Nations joint study concluded that secret detention violates international human rights and humanitarian law by placing detainees beyond the legal framework and rendering safeguards like habeas corpus ineffective.[1]