This second-generation prototype of a marijuana field tester being developed at Washington State University is larger than the planned final product. Tom Banse/KUOW hide caption

toggle caption Tom Banse/KUOW

High On The Highway: Scientists Try To Build A Marijuana Breath Test

  • Download
  • <iframe src="https://www.npr.org/player/embed/460577098/460602141" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript