From Perverts to Pranksters: System Maps — Two system maps were produced for both adult and juvenile offenders. Although seemingly effective, chemical castration raises serious ethical questions when not undertaken voluntarily it is reversible, unlike physical castration, but can pose serious health risks in some cases. Consequently, the study found that a majority of the public endorses broad community notification and related policies. She said that if she had known that a sex offender lived across the street, Megan would still be alive. His whereabouts remained unknown for nearly 27 years until remains were discovered just outside Paynesville, Minnesota in SORNA provides uniform minimum guidelines for registration of sex offenders, regardless of the state they live in. The study found the Practitioners Guide itself cites only one source which originates from "a mass market magazine aimed at a lay audience", and was bare assertion with no supporting citations by a treatment program counselor, who is not a scholar and has no expertise in sex offender recidivism. Yet as long as the registries remain bloated with low-risk offenders and our policies remain focused on punishment and stigmatization rather than prevention and rehabilitation, sex offender laws will continue to do more harm than good. Springer Publishing Co Inc. Contrary to public perception, recidivism rates are generally lower for sex offenders than non-sex offenders. States running offense-based systems use the conviction offense or the number of prior offenses as the criteria for tier assignment. SORNA requires states to widen the number of covered offenses and to include certain classes of juvenile offenders. Currently forty-two states have extended registration and community notification requirements to juveniles Szymanski By effectively diluting the sex offender registry with people who pose little threat to public safety, it is more difficult to identify and keep track of the high-risk offenders. In general, offense-based classification systems are used for their simplicity and uniformity.