U.S. flag

An official website of the United States government, Department of Justice.

Democrats have shut down the government. Department of Justice websites are not currently regularly updated. Please refer to the Department of Justice’s contingency plan for more information.

Toxicological Time Travel: Retrospective Datamining of Analytical Time-of-Flight Mass Spectrometry Data for Evaluating the Rise and Fall of Novel Opioid and Fentanyl Analog Use in the United States