This study used a regression-adjusted capture–recapture model to estimate the number of people at risk of arrest for offenses that involved amphetamine-type stimulants (ATS) from arrests and rearrests occurring in Quebec, Canada, controlling for year of first arrest, age, and gender.
The size of criminal populations is unknown, and policy decisions are typically based only on the number of offenses and offenders that come to the attention of the criminal justice system; however, the size of criminal populations may follow different trends than what is observed in official data. In the current study, the 4,989 individuals arrested were the visible part of an estimated 42,541 [36,936, 48,145] individuals otherwise at risk of arrest (12 percent). Additional results show that trends in criminal populations and risks of arrest vary across offense type and drug classifications. (publisher abstract modified)
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