The NIST Mass Spectral Library — one of the world's largest, most widely used databases used to identify unknown chemical compounds — just got bigger. In June, molecular fingerprints from more than 25,000 compounds were added to the library, bringing the total to more than 265,000.

Among the compounds whose fingerprints are included in this update are many dangerous drugs, according to NIST. They include dozens of synthetic cannabinoids and more than 30 types of fentanyl, the synthetic opioid that is driving an epidemic of overdoses nationwide.

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