[Code of Federal Regulations] [Title 50, Volume 7] [Revised as of January 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 50CFR221.57] [Page 108] TITLE 50--WILDLIFE AND FISHERIES CHAPTER II--NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE PART 221_PRESCRIPTIONS IN FERC HYDROPOWER LICENSES--Table of Contents Subpart B_Hearing Process Sec. 221.57 What is the standard of proof? The standard of proof is a preponderance of the evidence.