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Comment & Response
November 16, 2020

Marijuana Is Not the Only Cause of Drugged Driving—Reply

Author Affiliations
  • 1Zoox Inc, Foster City, California
  • 2Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
  • 3Center for Injury Research and Policy, Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
JAMA Intern Med. 2021;181(2):293-294. doi:10.1001/jamainternmed.2020.6275

In Reply In response to our Invited Commentary,1 Wood points out that marijuana is just 1 of many potentially impairing drugs and acknowledges the need for more data on drug use by drivers, raising a number of points concerning the difficulties in generating and using such data. Driver drug use can encompass legal/prescription medications, over-the-counter medicines, and illegal drugs. Each of these categories contains large numbers of compounds that can impair driving and increase crash risk on our roads. The 2013-2014 National Roadside Survey of Alcohol and Drug Use by Drivers conducted by the National Highway Traffic Safety Administration found that more than 22 percent of daytime and nighttime drivers tested positive for drugs that could impair driving.2 Marijuana, either alone or in combination with other drugs, accounted for about half of these positive tests. The remainder were substances other than marijuana.

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