Table 1.
Legal Δ9-tetrahydrocannabinol (THC) thresholds for drivers in states with per se laws
| State | Legal THC limit | Collected specimen | Year effective |
|---|---|---|---|
| Colorado | 5.0 μg/L in blood | Blood, urine, or OF | 2013 |
| Iowa | THC-COOH: 50.0 μg/L in urine | Blood or urine | 2010 |
| Montana | 5.0 μg/L in blood | Blood | 2013 |
| Nevada | THC: 10.0 μg/L in urine, 2.0 μg/L in blood THC-COOH: 15.0 μg/L in urine, 5.0 μg/L in blood | Blood, urine, or other bodily substance | 2003 |
| Ohio | THC: 10.0 μg/L in urine, 2.0 μg/L in blood THC-COOH: 35.0 μg/L in urine, 50.0 μg/L in blood THC-COOH in combination with alcohol or other drugs: 15.0 μg/L in urine, 5.0 μg/L in blood | Blood, urine, or other bodily substance | 2006 |
| Pennsylvania | THC or THC-COOH: 1.0 μg/L in blood or urine | Blood or urine | 2011 |
| Washington | 5.0 μg/L in blood | Blood | 2013 |
Abbreviations: OF oral fluid, THC Δ9-tetrahydrocannabinol, THC-COOH carboxy-Δ9-tetrahydrocannabinol.
Sources: (NORML). Drugged Driving. Washington, D.C. 2014a. http://norml.org/legal/drugged-driving. Accessed July 15 2014.; Lacey J, Brainard K, Snitow S. Drug Per Se Laws: A Review of Their Use in States. Washington, D.C.: National Highway Traffic Safety Administration (NHTSA). 2010. Accessed July 15 2014.; Avila EN. Minimum Levels of Controlled Substances or Their Metabolites in Blood to Establish Presence of Controlled Substance. Pennsylvania Bulletin. [2011] April 30. Accessed July 23 2014.; [Wash Rev Code § 46.61.502]); Walsh JM. A State-by-State Analysis of Laws Dealing With Driving Under the Influence of Drugs. Washington, D.C.: National Highway Traffic Safety Administration (NHTSA). 2009. Accessed July 12 2014.