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Do you know about DrugsData.org?
It's an Erowid project that does lab drug testing of anonymously
submitted samples & publishes the results online. [See Recent Results]
Heroin Use Statistics
by Erowid
2.2 1.8 1.8 1.6 1.1 1.1 1.1 1.2 1.2 1.3 1.2 1.1 1.2 1.1 1.3 1.3 0.9 1.2 1.1 1.2 1.6 1.8 2.1 2.0 2.0 2.4 1.8