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Convicted sex offenders who commit sudsequent crimes

During the three-year postrelease follow-up period, 3. Three other studies mentioned in the prior discussion about the recidivism of rapists also make contributions to the knowledge base about the recidivism patterns of child molesters. As part of their larger study designed to evaluate risk assessment schemes for sexual offenders, Knight and Thornton examined the recidivism rates of child molesters. Their analysis examined the recidivism of child molesters who had been referred to the Massachusetts Treatment Center for evaluation between and Again, given the high-risk nature of these offenders and the length of time that has passed since these individuals committed their referral offense, findings from the analysis may have limited application to child molesters today.

Still, several findings from the analysis are worth noting.

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First, Knight and Thornton , p. However, they did find that child molesters recidivated at a slower pace than rapists for both non-sexual victim-involved and victimless crimes.

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Findings from Harris and Hanson's analysis are particularly compelling because they document differential rates of recidivism for different types of child molesters based on follow-up periods of five, 10 and 15 years. For all child molesters in the analysis, the researchers found five-, and year sexual recidivism rates based on new charges or convictions of 13 percent, 18 percent and 23 percent, respectively.

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Table 2 presents the study's recidivism estimates based on new charges or convictions for five-, and year follow-up periods for molesters of boys, molesters of girls and incest offenders. Recidivism estimates are based on new convictions and charges. Table 2 shows that molesters of boys had the highest rates of sexual recidivism. Different patterns of reoffending within child molester populations have been found in other studies as well, with molesters of boys having higher recidivism rates than other types of child molesters see, e. It is important to keep in mind that the recidivism rates observed for child molesters, and for incest offenders particularly, are impacted by underreporting even more so than recidivism rates for other types of sex offenders, as research has shown that child victims who knew their perpetrator were the least likely to report their victimization Smith et al.

In a study that examined the recidivism of child molesters and non-sex offenders 15 to 30 years after their release from a Canadian prison, Hanson, Scott and Steffy found that child molesters had lower rates of overall recidivism based on reconviction than non-sex offenders 61 percent compared to Not all child molesters in the study, however, recidivated at the same rate. The highest rate of recidivism among child molesters in the study 77 percent was found for child molesters with previous sexual offenses, those who were never married and those who selected extrafamilial boy victims.

In contrast, the long-term recidivism rate for child molesters categorized as low risk was less than 20 percent. One study that did not find different rates of recidivism for child molesters based on victim gender was Prentky and colleagues' analysis of child molesters who were civilly committed in Massachusetts. The researchers cautioned, however, that this specific departure in their findings from other research may have been an artifact of the study sample's extensive prior criminal history for sexual offenses.

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The sample consisted of child molesters who were discharged from civil commitment in Massachusetts between and Again, generalizing certain findings from the analysis to other samples of sex offenders could be problematic because the offenders in the study were very high risk and the study period ended more than 25 years ago. Nonetheless, the research is still important because of its lengthy follow-up period.

Based on the year follow-up period, Prentky and his colleagues found a sexual recidivism rate of 52 percent defined as those charged with a subsequent sexual offense for the child molesters in the study. The overall new crime recidivism rate found after 25 years of follow-up was 75 percent.


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While the difference between the sexual recidivism rates for child molesters found by Prentky and colleagues using a year follow-up period 52 percent and Harris and Hanson using a year follow-up period 23 percent is striking, the nature and substantive significance of the difference can be interpreted in fundamentally different ways. One interpretation is that first-time recidivism may occur for some child molesters 20 or more years after criminal justice intervention and that recidivism estimates derived from shorter follow-up periods are likely to underestimate the lifetime risk of child molester reoffending Doren, Analyzing data from Prentky and colleagues and other studies, Doren , p.

While the rate at which child molesters are likely to sexually recidivate over the life course may be subject to further debate, current empirical evidence suggests that molesters of boys have higher short- and long-term recidivism rates than other types of sex offenders.


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It is important to keep in mind, however, that both gender-crossover and age-crossover offending are not uncommon and that far more research on the recidivism patterns of crossover offenders is needed Wilcox et al. A limited body of research exists on the recidivism rates of exhibitionists. Marshall, Eccles, and Barbaree reported recidivism data from two studies that examined the effectiveness of specific treatment approaches for exhibitionists. Both studies were based on samples that were small in size. The researchers found that nine of the 23 The second study examined recidivism for 17 males charged with exhibitionism and treated between and Based on a follow-up period of almost four years, the researchers found that four of the 17 Sugarman and colleagues examined recidivism for exhibitionists with a larger sample exhibitionists and a follow-up period of 17 years.

The researchers reported a percent recidivism rate based on a conviction for a contact sexual offense during the follow-up period, and a percent recidivism rate based on a conviction for any type of crime other than exposing. More recently, Rabinowitz-Greenberg and colleagues examined the recidivism of exhibitionists assessed at the Royal Ottawa Hospital Sexual Behaviors Clinic between and Based on an average follow-up period of 6.

Building upon the analysis, Firestone and colleagues examined recidivism for of the exhibitionists in the analysis conducted by Rabinowitz-Greenberg and colleagues, extending the follow-up period to an average of The researchers found that Sexual recidivists who were charged with or convicted of a hands-on sex crime during the Drawing firm conclusions about the extent of sex offender recidivism can be difficult due to a number of factors.

First, although there is universal agreement that the observed recidivism rates of sex offenders are underestimates of actual reoffending, the magnitude of the gap between observed and actual reoffending remains subject to debate. As a result, conclusions about the extent of sex offender recidivism and the propensity of sex offenders to reoffend over the life course inherently involve some uncertainty. Second, measurement variation across studies often produces disparate findings that can be difficult to interpret. Comparing and corroborating findings can be difficult for the same reason.

Third, short follow-up periods and small sample sizes limit the generalization of certain findings. Drawing firm conclusions about the propensity of specific subgroups of sex offenders to reoffend over the life course is particularly difficult, as sample sizes often fall to unrepresentative levels as follow-up periods grow longer. Still, recent research has produced several trustworthy findings concerning the recidivism rates of child molesters, rapists and sex offenders overall.

While a sound foundation of knowledge on the extent of sex offender recidivism has been produced in recent years, significant knowledge gaps and unresolved controversies remain. Variations across studies in the operational definition of recidivism, the length of the follow-up period employed and other measurement factors continue to make it difficult to make cross-study comparisons of observed recidivism rates. Interpreting disparate findings and their implications for policy and practice also remains a challenge. Research documenting the recidivism patterns of crossover offenders and other specific sex offender subtypes is needed.

While the operational definitions and follow-up periods employed in sex offender recidivism research will largely be dictated by the available data, studies that produce more readily comparable findings are greatly needed, as are those that employ follow-up periods longer than five years.

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Analyses that standardize the time at risk for all offenders in a given study using survival analysis also are needed. Future research should also attempt to build a stronger evidence base on the differential recidivism patterns of different types of sex offenders.

While important information on the recidivism of rapists and child molesters has been produced, far more evidence regarding the recidivism patterns of crossover offenders and other specific sex offender subtypes is needed. We must develop a way to bridge the gap between the perspective that "few sex offenders reoffend" and the evidence that few victims report their victimization.

Finally, far more policy-relevant research is needed on the absolute and relative risks that different types of sex offenders pose. The extant literature on sex offender recidivism has thus far been unable to decisively resolve the readily apparent controversy that exists in the field about the proper interpretation of recidivism data and its meaning for public policy.

On one hand, some researchers interpret the observed recidivism rates of sex offenders as low, and hence argue for revisions to the current sex offender policy framework. Other researchers are more reticent to interpret recidivism data in the same way, pointing out that the true reoffense rates of sex offenders remain largely unknown due to underreporting and other factors. There is little question that policies and practices aimed at the reduction of sex offender recidivism would be far more effective and cost-beneficial if they better aligned with the empirical evidence, but bridging the gap is plagued by measurement problems and conflicting interpretations of the existing scientific evidence.

Individual and community safety would no doubt be served by a redoubling of efforts to break down victim reporting barriers, improve research and build more meaningful collaborations between researchers, policymakers, practitioners and the public. Others are more reticent to interpret recidivism data in the same way, arguing that the true reoffense rates of sex offenders are high or unknown or that observed recidivism rates can be misleading because the propensity of sex offenders to reoffend is poorly reflected in officially recorded recidivism, particularly when short follow-up periods are involved.

Had these offenders actually been at risk in the community for the entire follow-up period, recidivism may have been detected, resulting in a higher observed recidivism rate for the entire group of offenders being studied. See endnote Advances in methods regarding heterogeneity and methodological variability can successfully address these criticisms. Meta-analyses that are based on prudent exclusionary criteria, incorporate statistical tests of homogeneity and explore how methodological and contextual variations impact treatment effects are uniquely equipped to provide policymakers and practitioners with highly trustworthy and credible evidence.

In one study, the criterion for recidivism was not specified. Average follow-up periods ranged from one to 21 years, with a median of 4. Thirty-eight studies reported sexual recidivism 4, treated sex offenders and 3, comparison offenders and 30 studies reported general recidivism 3, treated sex offenders and 2, comparison offenders. Recidivism was defined as reconviction in eight studies and rearrest in 11 studies.

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In 20 studies, broad definitions of recidivism were used, including parole violations, readmissions to institutions or community reports. Average follow-up periods ranged from one to 16 years, with a median of 46 months. The unweighted average recidivism rates were 12 percent for the treatment group and 24 percent for the comparison group.

The average follow-up period for treated sex offenders was Prentky and colleagues , for example, examined the recidivism rates of rapists and child molesters at various follow-up points; the longest was 25 years after the offenders' release from confinement.

The observed sexual recidivism rate after five years of follow-up was 19 percent for both rapists and child molesters. By comparison, the observed sexual recidivism rates after 25 years of follow-up were 39 percent for rapists and 52 percent for child molesters. These analyses are discussed in greater detail in the "Recidivism Rates: Different Types of Sex Offenders" section in this chapter. A recent Safer Society survey of sex offender treatment programs in the United States and Canada found that females accounted for about 5 percent of the clients treated in U. Hanson and Morton-Bourgon reported that one of the 84 studies in the meta-analysis focused on female sex offenders.

Based on the N-size reported in that study of female offenders, fewer than of the 20, sex offenders in the Hanson and Morton-Bourgon meta-analysis were female. The "rape" category excluded statutory rape or any other nonforcible sexual act with a minor or with someone unable to give legal or factual consent. Sex offenders whose imprisonment offense was a violent sex crime that could not be positively identified as "rape" were placed in the "sexual assault" category.

The three-year recidivism rates reported for the 6, sex offenders categorized as sexual assaulters follow: 5. Recidivism is reported as the failure rate, which is the proportion of individuals who recidivated or failed based on a standardized time at risk for all study subjects. Determining the simple proportion of individuals who reoffended during the follow-up period — the most common method of calculating a recidivism rate — can underestimate the rate of recidivism because some of the nonrecidivists may not have been at risk in the community for the entire follow-up period.

Had they been, recidivism may have been detected, resulting in a higher observed recidivism rate for the entire group of offenders being studied. By standardizing the at-risk time for all study subjects, survival analysis yields a more accurate estimate of recidivism.


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For more information on "Sex Offender Typologies," see chapter 3.