Sex offenders often commit more than one sexual assault, but there is variability in how many assaults they commit and in what pattern over time. Trajectory modeling studies typically use criminal history records as a data source to model perpetrators' sexual assault convictions, but this may underestimate the scope of offending, because so few sexual assaults result in a conviction. The current study used growth mixture models to identify and validate a four-class model of suspected serial sex offending that spanned ages 16 to 60. The four classes varied in the overall number of sexual assaults committed by each perpetrator and the ages of peak offending. All classes included sexual assaults identified through rape kit testing and through criminal history records. The study concludes that forensic DNA testing of rape kits can help identify suspected serial sexual offenders. DNA testing plus criminal history searches on identified offenders as standard investigation practice would provide police with a more complete picture of offenders' criminal behavior. (publisher abstract modified)
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