This is interesting so I dug a bit. Here is the amendment: https://www.congress.gov/amendment/109th-congress/senate-amendment/1977 https://www.congress.gov/amen

This is interesting so I dug a bit. Here is the amendment: https://www.congress.gov/amendment/109th-congress/senate-amendment/1977 https://www.congress.gov/amendment/109th-congress/senate-ame... The amendment prohibited "cruel, inhuman, or degrading treatment or punishment" for anyone in custody of the US government, including those physically outside of the US. Notably it was introduced by John McCain.