"So, okay," she went on, "next question: did you also know that there’s a private prison firm working on a house arrest system that allows judges to impose permanent surveillance? They call it SDORP—pronounced ‘stop!’—for sub-dermal observation and restraint platform. It’s a unit that goes in your gluteus muscle and if you do something the supervisor doesn’t like it can knock you out and call a team to come and pick you up. It’s perfect. Any environment can be a prison."