Flutterby™! : Testing leads to hard drug use?

Journal of Adolescent Health: Middle and High School Drug Testing and Student Illicit Drug Use: A National Study 1998–2011:

Because the study design is observational and the data are cross-sectional, no strong causal conclusions can be drawn. However, there is evidence of lower marijuana use in the presence of SDT, and evidence of higher use of illicit drugs other than marijuana. Until further research can clarify the apparent opposing associations, schools should approach SDT with caution.

Sounds to me like if kids think they may get caught, they figure why not get caught for the hard stuff?

Via Student Drug Testing Programs Linked To Spikes In ‘Hard’ Drug Use by way of a Scarleteen tweet.