Determining if a driver has too much alcohol in his or her system is now easily measured. But with more states approving the sale and use of recreational marijuana, knowing whether a driver is impaired with that drug—or other substances—is much more difficult to prove scientifically. In this episode, we explore actions states are taking to address this complex issue. Our guests are: 

• Robert Ritter, director of the Office of Impaired Driving and Occupant Protection at the National Highway Traffic Safety Administration.
• Representative Jonathan Singer (D-Colo.), who successfully guided legislation through his state legislature on this issue soon after Colorado became the first to approve recreational marijuana.

Additional Resources

• Transcription of Episode 73