Positivity Rates by Drug Category
For general U.S. workforce, as a percentage of all positives
(More than 5.7 million tests from January to December 2002)
| Drug Category | 2002 | 2001 | 2000 | 1999 | | Acid/Base | 0.25% | 0.23% | 0.07% | 0.14% | | Amphetamines | 6.7 | 5.5 | 4.8 | 4.3 | | Barbiturates | 2.9 | 3.2 | 3.5 | 3.7 | | Benzodiazepines | 5.0 | 5.0 | 4.2 | 3.3 | | Cocaine | 13.9 | 13.2 | 13.9 | 15.8 | | Marijuana | 57.5 | 60.9 | 36.0 | 62.6 | | Opiates | 5.3 | 5.5 | 5.2 | 5.1 | Oxidizing adulterants
(including Nitrites) | 0.48 | 0.51 | 0.88 | 1.6 | | PCP | 0.47 | 0.46 | 0.45 | 0.35 | | Propoxyphene | 5.6 | 4.0 | 2.5 | 2.0 | | Substituted | 0.54 | 0.48 | 0.56 | 0.80 | | Source: Quest Dynamics | | | | | |
