Registration and the Closure of Stranger-Perpetrated Sex Crimes Reported to Police.

A key goal of sex offender registration is to assist law enforcement in sexual assault investigations; to identify potential suspects when the perpetrator's identity is unknown. To date, however, no research has assessed the utility of sex offender registries in closing cases of sexual assault when the incident involved stranger perpetrators. Addressing this gap, the study drew on the National Incident-Based Reporting System (1992-2001) to test the effect of registry implementation on closure of stranger-involved sex crimes across six states. Comparing closure speeds from before and after registration began in each state, multivariate survival models showed incidents of stranger-perpetrated sexual assault were cleared 23% to 28% faster post-registration implementation. Incidents with juvenile victims and incidents with additional crimes beyond the sexual assault also closed significantly faster (regardless of whether a registry existed).