Medication/ Medication Class Observed Frequency Amphetamine 1.4% Benzodiazepines 23.0% Buprenorphine 1.0% Carisoprodol 4.6% Fentanyl 1.5% Meperidine 0.4% Methadone 2.2% Opiates 19.2% Propoxyphene 2.7% Tapentadol 0.2% Tramadol 4.1%

Table 8: Prevalence non-reported medications observed in 290,627 specimens.

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