I urge people to read this report which demonstrates that:
"U.S. forces, in many instances, used interrogation techniques on detainees that constitute torture. American personnel conducted an even larger number of interrogations that involved “cruel, inhuman, or degrading” treatment. Both categories of actions violate U.S. laws and international treaties. Such conduct was directly counter to values of the Constitution and our nation."
http://s3.documentcloud.org/documents/684407/constitution-project-report-on-detainee-treatment.pdf