As America grapples with how to reduce the number of people in prison, many have started to look at how an increase in the use of probation might be sending more people to prison than keeping them out. But in recent years, Arizona's adult probation department has been quietly retooling its system, putting fewer people in prison while reducing the number of probation violations by 29 percent, and the number of arrests of people on probation by 21 percent. NewsHour Weekend's Chris Booker reports on how the state estimates it has saved $392 million dollars in the process.