A four-minute cannabis test gets two samples wrong

Researchers in Texas tested a fast way to distinguish high-THC cannabis from hemp: a copper compound helps an instrument detect the relevant chemical signal without CBD interference. The method correctly classified 34 of 36 samples, about 94%; two errors were attributed to high cannabinol, or CBN, concentrations. The analysis itself takes roughly four minutes, with additional time needed for sample preparation. The experiment used a 1% THC decision threshold, so its results cannot automatically be applied to the legal 0.3% distinction: a small difference in percentages changes what the test establishes.