This week on Talk World Radio we're speaking with Kevin B. Smith who is the author of the brand new book The Jailer’s Reckoning: How Mass Incarceration Is Damaging America. Smith is also the Leland and Dorothy H. Olson Chair of Political Science at the University of Nebraska-Lincoln. The book shows that incarceration rates vary dramatically by state, within the United States, and that several factors correlate significantly with variations in those rates.