Hey, I just read this article today.  It takes place in 2011 and is about an inmates at a federal prison that had to choose between living with a violent cellmate or end up in shackles.  In the cell they had to spend nearly 24 hours a day together in a concrete room smaller than a parking space, can you imagine?   I learned that they have a form of punishment there and it is called "four-pointing".  They cuff each limb to the corner of a concrete slab or bed frame.  That just sounds like torture to me.  The guy that the story is about is serving a 35-year sentence for drug trafficking and assaulting a corrections officer.  This prison is known as the toughest prison and I can see why.  You really should read this article, it is very eye opening.