EditorialResearchers at the University of North Carolina at Chapel Hill test drug samples using a device known as a gas chromatograph-mass spectrometer in Chapel Hill, N.C., Oct. 4, 2022. (Erin Schaff/The New York Times)
EditorialChromatograph from a production sample on Dec. 21, 2021, at the marijuana start-up Sanity Group’s testing and processing facility near Frankfurt, Germany. (Laetitia Vancon/The New York Times)