From the Summary and Key Findings: "The Fentanyl Profiling Program (FPP) performs in-depth chemical analyses on fentanyl and fentanyl-related samples obtained from seizures made throughout the United States. Analytical methodologies developed at the Special Testing and Research Laboratory (SFL1) allow in-depth reporting on samples. The Fentanyl Profiling Program Report summarizes the results and conclusions derived from these analyses on a bi-annual basis. FPP data is not intended to reflect U.S. market share, but is rather a snapshot of samples submitted to this laboratory from the eight DEA [Drug Enforcement Administration] regional and sub-regional chemistry laboratories."
U.S. Drug Enforcement Administration: https://www.dea.gov/