General public sentiment and anecdotal evidence suggests that sex offenders are highly recidivistic. Furthermore, these similar beliefs have influenced a series of recent policy and legislative changes targeting sex offenders. This study examined the impact of sex offender registration and notification (SORN) on sex offender recidivism among a cohort of Iowa prisoners released prior to SORN and a cohort of Iowa prisoners released post-SORN. Results from semiparametric group-based trajectory models demonstrated that both sex offender samples had similar trajectory groups, that is, one group of nonrecidivist sex offenders, another group of very low-rate sex recidivists, and a small high-rate group of sex recidivists. Study limitations and implications for sex offender registration and community notification systems are also discussed.
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