“People who commit homicides or sex offenses have extremely low re-offense rates

Really good study released this month by CAPPS ; highlights the LOW recidivism rate for people with sex offenses

First Article: Very few violent offenders on parole return to prison for similar crimes, study says:

http://www.mlive.com/lansing-news/index.ssf/2014/12/very_few_violent_offenders_on.html 

Second Article: Paroling people who committed serious crimes:

http://www.capps-mi.org/wp-content/uploads/2014/12/CAPPS-Paroling-people-who-committed-serious-crimes-11-23-14.pdf