The Controlled Substance Act of 1970 classified the plant cannabis, which was historically classified as either marijuana or hemp, as an illegal drug, a Schedule I controlled substance with a high potential for abuse and no FDA-approved medical use in the United States. For almost 50 years, hundreds of thousands of people were arrested and imprisoned for possessing it. The Farm Bill of 2018 legalized the form of cannabis classified as hemp, while the form classified as marijuana remained illegal. The law left how to tell the difference up to law enforcement and forensic laboratories, which has proven difficult, time consuming, and expensive. Scientists use the amount of THC (one of the psychoactive components of cannabis) present in a cannabis plant to differentiate hemp from marijuana. The fact that many states have decriminalized the use of marijuana further complicates cannabis regulation. As a result of the Farm Bill, forensic laboratories must measure the exact amount of THC in seized evidence to differentiate hemp from marijuana. Thus, a new problem emerged for already backlogged crime labs. How could labs perform such precise measurements quickly and easily when few labs had the personnel, instrumentation, and protocols to do so? Two National Institute of Justice-supported labs addressed this problem using different types of mass spectrometry that can measure the exact amount of THC present in a sample: gas chromatography-mass spectrometry and direct analysis in real time-high-resolution mass spectrometry.
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