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Alcohol is the most common cause of fatal motor vehicle accidents, and crashes involving trucks weighing more than 5 tons are particularly devastating. In 1994, the U.S. government mandated the random screening of truck drivers for alcohol, and since then, alcohol involvement in fatal crashes of large trucks has decreased by 77%. To determine whether this decrease occurred because of the mandate or because of more general trends in drinking and driving (e.g., tighter licensing standards and lower acceptable blood alcohol levels), these researchers examined federal data between 1988 and 2003 on 71,606 fatal accidents involving trucks and 320,647 fatal accidents involving passenger cars, drivers of which do not undergo mandated random testing…