Assessing the impacts of a drug testing error in a correctional setting

Area of Science:

• Forensic Toxicology
• Public Health in Correctional Settings
• Substance Use Disorder Treatment

Background:

• Urinalysis screening is crucial for substance use treatment in carceral settings.
• Test results can influence both clinical treatment and parole decisions.
• A reported reagent error in opiate testing within California prisons necessitates investigation.

Purpose of the Study:

• To quantify the scale and distribution of a reagent error in opiate urinalysis testing.
• To assess the impact of this error on Medication-Assisted Treatment (MAT) programs in California prisons.
• To understand the potential consequences for parole suitability determinations.

Main Methods:

• Utilized administrative datasets from the California Department of Corrections and Rehabilitation (CDCR).
• Applied statistical methods including differences-in-differences (DD), interrupted time-series analysis, and structural break tests.
• Analyzed monthly aggregated and individual-level opiate urinalysis test data from April to July 2024.

Main Results:

• Estimated excess positive opiate tests due to the error ranged from 4490 to 5839.
• A median estimate of 5425 excess positive results was identified.
• Facility-specific increases in positive test rates ranged from approximately 2 to over 16 percentage points above baseline.

Conclusions:

• The reagent error significantly inflated positive opiate test results in California correctional facilities.
• Findings emphasize the critical need for enhanced quality control and confirmatory testing in correctional urinalysis.
• Remedial reviews of parole actions affected by potentially erroneous results may be necessary.