1. Ramaekers JG, Berghaus G, van Laar M, Drummer OH. Dose related risk of motor vehicle crashes after cannabis use. Drug Alcohol Dep. 2014;73:109–19.
2. Pertwee RG. Cannabinoid pharmacology. British J Pharm. 2006;147:S163–71.
3. Teixeira H, Proenca P, Castanheira A, Santos S, Lopez-Rivadulla M, Corte-Real F, et al. Validated method for the simultaneous determination of Δ9-THC and Δ9-THC-COOH in oral fluid, urine and whole blood using solid-phase extraction and liquid chromatography–mass spectrometry with electrospray ionization. For Sci Int. 2004;146S:S61–3.
4. Chiarotti M, Costamagna L. Analysis of 11-nor-9-carboxy-delta(9)-tetrahydrocannabinol in biological samples by gas chromatography tandem mass spectrometry (GC/MS-MS). For Sci Int. 2000;114:1–6.
5. Kelly E, Darke S, Ross J. A review of drug use and driving: epidemiology, impairment, risk factors and risk perceptions. Drug Alcohol Rev. 2004;23:319–44.