Public safety experts and advocates disagree about what conclusions can be drawn from data on the presence of alcohol or other drugs in the bodies of people involved in deadly crashes.
Drivers distracted by their devices are a well-documented, rising cause of traffic crashes, but there are a growing number of pedestrians, too, who can become oblivious to traffic around them.
The highly rated variety of medical marijuana known as "Blue Dream" was displayed among other strains at a cannabis farmers market in Los Angeles in 2014.
Frederic J. Brown/AFP/Getty Images
Although Uber has repeatedly extolled drunken-driving reduction as a benefit of its service, a new study of data from across the U.S. finds ride-sharing apps have had no effect on alcohol-related traffic fatalities.
The BACTrack Vio keychain breathalyzer and app on the iPhone at NPR headquarters in Washington, D.C. A public health researcher says tools like this could help people make better decisions about alcohol use.