; (2) efficiencies of allowing the safe transportation of hazardous materials by unmanned aircraft systems and that the carriage of hazardous materials complies with Hazardous Materials Regulations, including any changes to the Hazardous Materials Regulations adopted pursuant to this section; (3) the risk profile of the transportation of hazardous materials by unmanned aircraft systems, taking into consideration the risk associated with differing weights, quantities, and Packing Group classifications of hazardous materials