AbstractThis paper analyzes the deterrence implications of different inmate assistance programs (IAPs), carefully distinguishing between deterrence of first offenses and recidivism. All IAPs considered in our model reduce recidivism, and we identify IAPs that also reduce the first offense rate. However, IAPs which increase work opportunities, improve the reintegration of exiting inmates, and moderate individual’s self-control issues may lower the deterrence of first offenses, if this possibility is not adequately anticipated when designing these IAPs.