First, pill testing has been shown to
change the black market. Products identified as particularly dangerous that subsequently became the subject of warning campaigns were found to leave the market.
Research also shows the ingredients of tested pills started to correspond to the expected components over time. This suggests pill testing might be able to change the black market in positive ways.
Third, pill testing changes behaviour:
research from Austria shows 50% of those who had their drugs tested said the results affected their consumption choices. Two-thirds said they wouldn’t consume the drug and would warn friends in cases of negative results.
Visits to pill-testing booths create an important opportunity for providing support and information over and above the testing itself. They enable drug services to contact a population that is otherwise difficult to reach because these people are not experiencing acute drug problems. Indeed, the intervention has been
used to establish contact and as the basis for follow-up work with members of not-yet-problematic, but nevertheless high-risk, groups of recreational drug users.
Finally, pill testing means we can
capture long-term data about the actual substances present in the drug scene. And it creates the potential for
an early warning system beyond immediate users. This is becoming all the more important as new psychoactive substances that may be used as adulterants are appearing more frequently.
https://ndarc.med.unsw.edu.au/node/301000974