The predictability of the Addiction Severity Index criminal justice assessment instrument and future imprisonment: A Swedish registry study with a national sample of adults with risky substance use.

OBJECTIVE: In Sweden, social workers uses the Addiction Severity Index (ASI) as their main assessment tool when assessing individuals with risky substance use (RSU) or substance use disorder. The aim of this study is to identify among individuals with RSU, the associations of ASI Composite Scores (CSs) with future imprisonment controlling for age, education level and gender.

METHOD: Baseline ASI-data was merged with national registry data on prison sentences (2003-2016). Cox regression was used to estimate the associations between CSs for alcohol, drugs other than alcohol, legal, family and social relationships, employment, mental- and physical health and future imprisonment for adults (n = 14,914) assessed for RSU.

RESULTS: The regression showed that all ASI CSs, age, education level and gender were significantly associated with imprisonment post ASI base-line assessment. The variables with the strongest association with imprisonment were ASI legal CS, followed by ASI drugs other than alcohol CS, ASI employment CS and being a male. ASI legal score showed the strongest association with imprisonment, with a 6 time increase in likelihood of imprisonment.

DISCUSSION: Given the findings in this study, the strong significant association between ASI legal CS and future imprisonment, it seems as that the ASI-assessment instrument is a reliable and trustworthy assessment tool to use in clinical work. This should motivate social workers and other clinical health professionals to use and rely on the ASI assessment in their intervention planning for clients with RSU, to hopefully reduce future imprisonment and improve their social situation.