The document summarizes a study by American criminologist Dr. Joan R. Petersilia on criminal justice policies for the mentally retarded. The study finds that the mentally retarded are often unable to understand their Miranda rights and confess to crimes they did not commit. They also have difficulty with plea bargaining, testifying credibly in court, and impressing parole boards. As a result, they tend to serve longer sentences and have higher recidivism rates than other offenders. The document calls for reforms like screening for mental disabilities, diverting certain offenders to supervised probation, and programs to help with job training and reintegration into society. This could help the mentally retarded while also saving taxpayer money on incarceration costs.