I'm not sure that is true in general. https://www.federalregister.gov/documents/2020/10/02/2020-19305/schedules-of-controlled-substances-placement-of-crotonyl-

I'm not sure that is true in general. https://www.federalregister.gov/documents/2020/10/02/2020-19305/schedules-of-controlled-substances-placement-of-crotonyl-fentanyl-in-schedule-i https://www.federalregister.gov/documents/2020/10/02/2020-19...