U.N. Convention Against Torture: Overview of U.S. Implementation Policy Concerning the Removal of Aliens [Updated October 12, 2007] [open pdf - 151KB]
"The United Nations Convention Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment (CAT) requires signatory parties to take measures to end torture within their territorial jurisdictions. For purposes of the Convention, torture is defined as an extreme form of cruel and inhuman punishment committed under the color of law. The Convention allows for no circumstances or emergencies where torture could be permitted. Additionally, CAT Article 3 requires that no state party expel, return, or extradite a person to another country where there are substantial grounds to believe he would be subjected to torture. CAT Article 3 does not expressly prohibit persons from being removed to countries where they would face cruel, inhuman, or degrading treatment not rising to the level of torture."
CRS Report for Congress, RL32276