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Positive alcohol by toxicology declined over time (subject to the limitations of the dataset), but all other drugs have increased from 2010 to 2017 (all comparisons over time P<0.0001). The incidence of tetrahydrocannabinol (THC), benzodiazepines, and cocaine has doubled, and amphetamines (combination of all types) have increased >5-fold in the study period while opiate use has nearly tripled.
