Honestly the death penalty should be handled by the locals by firing squad. Sure you could rehabilitate criminals, but what if they just play it off like they have been saved only to go out and commit more crime. Let's say some one was completely rehabilitated, but then they go back to the same area that shaped them and fall back into the same crap. Rehab only helps people that help themselves, if they committed a crime, then they already failed at helping themselves. I do believe there should be a system to rehabilitate prisoners, but like I said, if you can't help yourself, no one can help you.