If there is a working therapeutic or drug, they cannot fast track their experimental vaccine.
See second paragraph.
https://www.fda.gov/emergency-preparedness-and-response/mcm-legal-regulatory-and-policy-framework/emergency-use-authorization?fbclid=IwAR1gY6YmHi5m6mXWmvAmHVSLeklu0kYWL_LmSmUvS8B6CAJwoX6bPlHoF8Y#covidtherapeutics
Under section 564 of the Federal Food, Drug, and Cosmetic Act (FD&C Act), the FDA Commissioner may allow unapproved medical products or unapproved uses of approved medical products to be used in an emergency to diagnose, treat, or prevent serious or life-threatening diseases or conditions caused by CBRN threat agents when there are no adequate, approved, and available alternatives