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Although Megan's Law was passed more than 10 years ago, very little is known as to whether it reduces sex offender recidivism significantly. Using a retrospective quasi‐experimental design, we examine whether community notification has a deterrent effect by comparing the recidivism rates of 155 level 3 (“high public risk”) sex offenders released from Minnesota prisons between 1997 and 2002 who were subject to broad notification with two separate control groups who were not. The first control group (referred to as the prenotification group) contained 125 sex offenders released between 1990 and 1996 (the 7 years preceding the implementation of the Community Notification Act) who likely would have been subject to broad community notification had the law been in effect at the time of their release. The second control group (referred to as the non‐notification group) was composed of 155 offenders (37 level 1 and 118 level 2) released between 1997 and 2002 who were not subject to broad community notification. The results from the Cox proportional hazards models reveal that broad community notification significantly reduced the risk of time to a sex reoffense (rearrest, reconviction, and reincarceration) compared with both control groups. The findings were mixed, however, for both non‐sex and general reoffending. Whereas broad community notification significantly reduced the risk of timing to both non‐sex and general recidivism compared with the prenotification group, no such effects were found in the non‐notification group analyses. We discuss the implications of these results and attempt to explain why Megan's Law seems to reduce sex offense recidivism in Minnesota. 相似文献