Reviews of the literature have looked at what in general are called “sanctions”. In those reviews, the sanctions are a range of interventions from electronic monitoring to longer sentences to boot camps and “scared straight” programs. When those sanctions are looked at together, they do not show a reduction in recidivism. If anything, on average they show a slight increase in recidivism of about 3%.
On February 9th, 2012. See this statement in context.