28 percent of surveyed high school seniors say they've driven after drinking or doing drugs in the past two weeks, or have been a passenger with an impaired driver.
A new study from the University of Michigan found the prevalence of this behavior decreased from 32 percent in 2001.
But, during the past three years, there's been an increase in the number of seniors who drove after smoking marijuana.
Boys were more likely to drive impaired, but there was no gender differences for kids who rode in cars with drivers who had been using drugs or alcohol.
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