Controlled Psychoactive Substances and Workplace Drug Testing
Table 1: Recommended Cut-off Concentrations (ng/mL) for screening analysis in SAMHSA and, EWDTS
| Substance | SAMHSA and T.C Ministry of Health | EWDTS |
| Amphetamine | 500 | 500 |
| Benzodiazepine | 300 | 200 |
| Cannabinoid (THC-COOH) | 50 | 50 |
| Cocaine | 150 | 150 |
| Opiate | 2000 | 300 |