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THE FOLLOWING STUDIES EXAMINE THE IMPACT OF CANNABIS ON PSYCHOMOTOR SKILLS
RELATIVE TO SPECIFIC THC/BLOOD LEVELS. A COUPLE OF THESE (Bedard and
Laumon) ALSO MAKE TACIT COMPARISONS TO THC LEVELS VERSUS BAC LEVELS. YOU'LL
NOTE THAT VIRTUALLY ALL OF THIS ANALYSIS IS TAKING PLACE OVERSEAS. PROPOSED
THC/BLOOD PER SE LIMITS OF 3-5ng/ml (such as those proposed in Michigan)
TYPICALLY EMERGE FROM THE BODY OF WORK BELOW.
Bedard et al. 2007. The impact of cannabis on driving. Canadian Journal of
Public Health 98: 6-11.
http://norml.org/index.cfm?Group_ID=7189
Khiabani et al. 2006. Relationship between THC concentrations in blood and
impairment in apprehended drivers. Traffic Injury Prevention 7: 111-116.
Online presentation here: http://www.icadts.org/oslo2005/Oslo2005-07.pdf
Raemakers et al. 2006. Cognition and motor control as a function of THC
concentration in serum and oral fluid: limits of impairment. Drug and
alcohol dependence (E-pub ahead of print).
Laumon et al. 2006. Cannabis intoxication and fatal road crashes in France:
population based case-control study. British Medical Journal.
http://www.bmj.com/cgi/content/abstract/331/7529/1371
Groetnhermen et al. 2005. Developing science-based per se limits for driving
under the influence of cannabis.
http://www.canorml.org/healthfacts/DUICreport.2005.pdf
Movig et al. 2004. Psychoactive substance use and the risk of motor vehicle
accidents. Accident Analysis and Prevention 36: 631-636.
Raemakers et al. 2004. Dose related risk of motor vehicle crashes after
cannabis use. Drug and Alcohol Dependence 73: 109-119.
Drummer et al. 2004. The involvement of drugs in drivers of motor vehicles
killed in Australian road traffic crashes. Accident Analysis and Prevention
36: 239-248.
*Note: Several reviews published during this same period assessing the
association between the detection of THC-COOH (inactive metabolite in urine)
and accident risk and/or self-reported marijuana use and accident risk found
no increased association. These include papers by Smink et al, (2005),
Soderstrom (2005), Blows et al (2005), Movig (2004) etc.
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