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Discordant Drug Checking Results and Risk Reduction Behaviours: Findings From the ChecKnow Study in France
Samuel Tobias1,2, Julio Del Amo3,4, Sophie Albert3,4
1British Columbia Centre on Substance Use, Vancouver, Canada.
Drug and Alcohol Review
|July 21, 2026
Summary
Drug checking services (DCS) inform users about drug contents, promoting safer practices. Unexpected results from DCS significantly increase risk-reducing behaviors among drug users.
Area of Science:
- Public Health
- Drug Use Research
- Behavioral Science
Background:
- Drug checking services (DCS) offer vital information on unregulated substance composition.
- Evaluating the impact of DCS on user behavior is crucial for harm reduction strategies.
- Previous research on DCS-induced behavior change remains limited.
Purpose of the Study:
- To assess behavior change in response to drug checking results among French DCS users.
- To quantify the association between unexpected drug checking results and risk-reducing behaviors.
Main Methods:
- Utilized cross-sectional baseline data from the French ChecKnow e-cohort.
- Identified participants who accessed face-to-face DCS within six months.
- Employed Poisson regression to analyze the association between drug checking results and risk-reducing behaviors, adjusting for confounders.
Main Results:
- Among 480 DCS users, unexpected results correlated with increased risk-reducing behaviors.
- Substances containing adulterants (aPR=3.34) or entirely different substances (aPR=5.48) showed the strongest associations.
- Even diluted substances (aPR=2.78) were linked to higher engagement in safer practices.
Conclusions:
- Unexpected drug checking results are associated with a graded increase in risk-reducing behaviors.
- DCS effectively promote adaptive behaviors in response to potential drug-related risks.
- Findings support the role of DCS in enhancing drug safety and harm reduction.
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