waterboarding should be banned.
Do what Luca Brasi did in the Godfather book.
Tied two men to chairs, sawed one into pieces and the other one choked to death on his gag.
Drop the gag though. Don’t want the second one choking to death before spilling secrets.
That kind of thing has serious repercussions. Like the old Vietnam story about two NVG fighters being taken up into a helicopter. The interrogator pushes the first one out and he falls to his death. The interrogator asks the second who his superior commander is and the prisoner says, the one you just pushed out.
You never know who really has the information, so killing one to force the other to talk is extremely counter productive.