; (4) an analysis of sentences attributable to criminal charges involving fentanyl-related substances, comparing those sentences to sentences attributable to criminal charges involving fentanyl and individually scheduled fentanyl analogues; and (5) an analysis of the efficacy of class scheduling generally, in terms of reducing the proliferation of new controlled substance analogues. (b) Consultations In developing the report required by subsection (a), the Comptroller General— (1) shall consider the views of the Secretary of Health and Human Services, the Attorney General, the Secretary of Homeland Security, the Secretary of State, the Director of the Office of National Drug Control Policy, the scientific and medical research community, the State and local law enforcement community, and the civil rights and criminal justice reform communities; and (2) to the greatest extent possible, should base such report on reliable data and empirical information.