The arrests and seizure of narcotics were made as an ongoing, multi-agency drug trafficking investigation.
Federal authorities seized 370 gallons of liquid heroin and arrested four on drug trafficking charges after the suspects were apprehended at a hotel in Tigard last month.
I think that's about 1/5 of all heroin intercepted in the US in a typical year. https://www.unodc.org/unodc/en/data-and-analysis/wdr2023_annex.html