"THE PROJECT BIOSHIELD ACT OF 2004 (Public Law [P.L.] 108-276) was designed to provide additional and more flexible authorities and funding to support financially the development and procurement of medical countermeasures against chemical, biological, radiological, and nuclear (CBRN) threat agents, referred to as the Project BioShield Program (PBS). The Project BioShield Act was also designed to provide the government with the authority to quickly authorize their use during emergencies. These authorities were further delineated, clarified, expanded, and extended by the Pandemic and All-Hazards Preparedness Act of 2006, P.L. 109-417, the legislation that authorized the establishment of the Biomedical Advanced Research and Development Authority (BARDA) within the U.S. Department of Health and Human Services (HHS). These authorities were further refined, extended, and expanded under the Pandemic and All-Hazards Preparedness Reauthorization Act of 2013, P.L. 113-5 (PAHPRA), which reauthorized the Special Reserve Fund and expanded the Secretary's authorities to permit use of unapproved products or unapproved uses of approved products during emergencies."
Medical Countermeasures: https://www.medicalcountermeasures.gov/