"Pill testing interventions are important measures to enter into contact with hard-to-reach populations and to raise their interest in preventive and harm reduction messages."
Source
Kriener, Harald, Renate Billeth, Christoph Gollner, Sophie Lachout, Paul Neubauer, Rainer Schmid, "An Inventory of On-Site Pill-Testing Interventions in the EU" (Lisbon, Portugal: European Monitoring Centre for Drugs and Drug Addiction, 2001), p. 60.
http://www.emcdda.europa.eu/a…
