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Does correctional supervision of amphetamine users reduce the risk of re-offending?
Don Weatherburn1, Steve Yeong2
1National Drug and Alcohol Research Centre, University of New South Wales, Australia.
Aim:
To examine the specific deterrent effect of offender supervision on the risk of a further offence by persons convicted of amphetamine use and/or possession.
Design:
Observational study of two groups matched on a wide range of factors using augmented inverse probability of treatment weighting.
Setting:
New South Wales (NSW), Australia.
Participants:
A total of 2099 persons convicted of amphetamine use and/or possession and placed on either a supervised good behaviour bond (1004) or a bond without supervision (1096).
Measurements:
Conviction for another amphetamine use/possession offence, any drug offence, assault or theft within 48 months free time after the index court appearance.
Findings:
Only two of the treatment estimates were consistent with a deterrent effect. Where the outcome was an assault offence, the estimated reduction in risk of re-offending was 1%. Where the outcome was a theft offence, the estimated reduction in the risk of reoffending was 0.07%. Neither result was statistically significant. The coefficients measuring the effect of supervision on the remaining two outcomes (use/possess amphetamine and use/possess any drug) were both positive and not statistically significant.
Conclusion:
Correctional supervision does not appear to have been effective in New South Wales, Australia, in reducing the risk of reoffending among people convicted of amphetamine use/possession.
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