Abstract
The current study provides an evaluation of a substance abuse treatment program for probationers in a county in the state of Texas. Relying on a quasi-experimental design with a propensity score matched sample of 69 treatment group subjects and 69 control group subjects, the results revealed that while a significant treatment effect was observed for program participants in terms of a reduction in recidivism, a significant treatment effect on the percentage of people failing drug tests or the rate of failed drug tests was not detected. Study limitations and implications are also discussed.
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Notes
It is important to note that there does exist a vast literature evaluating drug courts (see Marlowe, 2010), but as this study is evaluating a local in office substance abuse treatment program run by LCDC counselors we do not review or focus on this literature specifically.
After removing cases that did not have complete data, the sample that was considered for the analysis was 284 control group subjects and 91 treatment group subjects.
Due to the strict (and conventional) caliper restriction of .10 applied to identify matches, 69 of the 91 treatment group subjects were effectively matched. Or in other words, 22 of the treatment group subjects were not able to be matched to a control group subject with a high degree of precision based on the caliper restriction. As such, the final sample of matched treatment group subjects and control group subjects was 69 treatment group subjects and 69 control group subjects.
One of the reviewers made an excellent point regarding other potential sources of selection bias that cannot be addressed by PSM in this study due to the data being unavailable. Specifically, length of substance abuse history and other specific eligibility conditions for the SATP program.
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Hollis, M.E., Jennings, W.G. & Hankhouse, S. An Outcome Evaluation of a Substance Abuse Program for Probationers: Findings from a Quasi-Experimental Design. Am J Crim Just 44, 395–408 (2019). https://doi.org/10.1007/s12103-019-9472-z
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DOI: https://doi.org/10.1007/s12103-019-9472-z
Keywords
- Probation
- Recidivism
- Substance abuse
- Treatment
- Propensity score matching