Pictures please tag the library on social media. Until the last few decades amerigas incarceration rate was on the par with that of other liberal democracies would however in the last 40 years we have seen a 700 increase in incarceration in the land of the free. We have the highest incarceration rate per capita of anywhere in the world under other than north korea but there is not enough data coming out to know for sure. What is to blame for america being number one at locking up its own citizens . Many theories exist. Tonight we will hear about them from an expert in the field, john pfaff has spent 15 years studying data on imprisonment and is here to discuss his book which seeks to debunk some of the more popular theories and providing his own take on this natural catastrophe. He is professor of law with a focusing criminal law, sentencing law and law of economics. He was published in journal of criminology and economics review and federal sentencing reporter among others and was rec