National Wastewater helped us track COVID-19 strains. Some say it can do the same for drug use 7:59am March 24, 2024 by Ayesha Rascoe Share URL copied to clipboard! Copyright 2024 NPR. To see more, visit https://www.npr.org. 300x250 Ad 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate