(Difference Between Drug and Alcohol Per Se Laws) "Drug per se laws are not quite analogous to the alcohol impaired-driving per se laws now in effect in every State make it illegal to operate a motor vehicle with a blood alcohol concentration (BAC) of .08 grams per deciliter or greater. Alcohol-impaired driving per se laws are based on evidence that all drivers are impaired at .08 BAC. Drug per se laws are more analogous to zero-tolerance laws that make it illegal to drive with certain drugs in the system."
Statistics and data relating to operating a vehicle while under the influence of an intoxicant (DUII), also referred to as drugged driving, drunk driving, driving under the influence (DUI), or driving under the influence of drugs (DUID).
(Prevalence and Trends in Alcohol Use by Drivers in the US) "The comparison of the BAC [Blood Alcohol Content] test results from the four NRS [National Roadside Survey] studies suggests that, during the most recent decade, there continues to be a downward trend in the proportion of drivers with positive BACs21 on U.S. roads on weekend nights, from 36.1 percent in 1973, 25.9 percent in 1986, 16.9 percent in 1996, to a low of 12.4 percent in 2007.
(Prevalence of Drug Use by Drivers in the US) "The recently published 2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug Results reported the drug prevalence (detected by oral fluid and blood samples) in 7,719 weekend drivers who served as participants in the survey (Lacey et al., 2009).
(Prevalence of Drug Use by Drivers in the US) "Based on the oral fluid results, more nighttime drivers (14.4%) were drug-positive then were daytime drivers (11.0%). Based on the blood test results which were administered only at nighttime, 13.8% of the drivers were drug-positive. Using the combined results of either or both oral fluid and blood tests, 16.3% of the nighttime drivers were drug-positive.
"The most commonly detected drugs were Marijuana (THC) at 8.6%, Cocaine at 3.9%, and Methamphetamine at 1.3% of nighttime drivers."
(Prevalence of Alcohol Use by Drivers in the US, by Gender) "The percentage of male drivers with a BAC over the current legal limit of 0.08 g/dL was 42% higher than the percentage of female drivers with illegal BACs (Figure 2). A regression analysis showed that males were significantly more likely to have illegal BACs (p < .01). Over 2% of the weekend nighttime drivers had illegal BACs (>0.08g/dL) while only 0.1% of daytime drivers had illegal BACs."
(Prevalence of Alcohol Use Among Drivers in US) "The 2007 NRS found a dramatic decline in the number of drinking drivers with BACs [Blood Alcohol Content] at or above the current legal limit of 0.08 g/dL* on weekend nights compared to previous surveys (Figure 1). In 1973, 7.5% of drivers NHTSA’s National Center for Statistics and Analysis had BACs at or above 0.08 g/dL. In 2007, there were only 2.2% of drivers with a BAC at or above the current legal limit. This represents a decline of 71% in the percentage of alcohol-impaired drivers on the road on weekend nights.
(Prevalence of Substance Use Among Injured Drivers) "Studies of hospitalised, seriously injured car drivers were conducted in six countries, and studies of car drivers killed in accidents took place in four countries. Among the injured or killed drivers, the most commonly consumed substance was alcohol alone, followed by alcohol combined with another substance. The use of illicit drugs alone was not frequently detected.
(Prevalence of Substance Use Among Drivers in EU) "Roadside surveys conducted in 13 countries across Europe, in which blood or oral fluid samples from 50 000 drivers were analysed, revealed that alcohol was present in 3.48 %, illicit drugs in 1.90 %, medicines in 1.36 %, combinations of drugs or medicines in 0.39 % and alcohol combined with drugs or medicines in 0.37 %. However, there were large differences among the mean values in the regions of northern, eastern, southern and western Europe.
(Drugged Driving and DUII Laws in The Netherlands) "According to a European study, the prevalence in the Netherlands of the use of alcohol by car drivers is 2.2%, compared to 3.5% average in Europe. The use of cannabis by car drivers (1.7%) is above the European average of 1.3% (SWOV factsheet 2011). According to the Road Traffic Act it is forbidden to drive under the influence of a (illegal) substance affecting one's driving ability.
(Prevalence of Drugged Driving Estimated by NSDUH) "In 2011, 9.4 million persons or 3.7 percent of the population aged 12 or older reported driving under the influence of illicit drugs during the past year. This was a decrease from the rate in 2010 (4.2 percent) and the rate in 2002 (4.7 percent). Across age groups, the rate of driving under the influence of illicit drugs in 2011 was highest among young adults aged 18 to 25 (11.6 percent); this rate for young adults in 2011 was lower than the rate in 2010 (12.7 percent).