According to a recent update by NIJ, existing testing methods fall short of accurately quantifying THC levels in samples. However, the researchers supported by NIJ have made a breakthrough by utilizing two distinct forms of mass spectrometry—gas chromatography-mass spectrometry (GC-MS) and direct analysis in real time-high-resolution mass spectrometry (DART-HRMS)—to isolate THC content, along with other cannabinoids.