Two things about that torture report:
International law prohibits the granting of immunities to public officials who have engaged in acts of torture. This applies not only to the actual perpetrators but also to those senior officials within the US Government who devised, planned and authorised these crimes.And:
--- B. Emerson, UN Rapporteur on Human Rights
Each State Party is required either to prosecute torturers who are found in its territory or to extradite them to other countries for prosecution --United Nations Convention on TortureUpdate, December 12: Full text of the report downloads here