For the past 30 years, police and highway safety officials have focused on alcohol-related auto fatalities. But little research has been done into how many wrecks are caused by drivers intoxicated by drugs, the National Highway Traffic Safety Administration states in a report released last July.
The Highway administration conducted its first survey of drug use among random drivers and found 11 percent of drivers tested positive for drug use during the day and 14 percent tested positive for drug use at night.
The same survey found 2.2 percent of the drivers surveyed at night during weekends were over the legal limit for alcohol use.
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