14 C.F.R. § 13.223 Standard of proof.
Title 14 - Aeronautics and Space
The administrative law judge shall issue an initial decision or shall rule in a party's favor only if the decision or ruling is supported by, and in accordance with, the reliable, probative, and substantial evidence contained in the record. In order to prevail, the party with the burden of proof shall prove the party's case or defense by a preponderance of reliable, probative, and substantial evidence.
Title 14: Aeronautics and Space
PART 13—INVESTIGATIVE AND ENFORCEMENT PROCEDURES
Subpart G—Rules of Practice in FAA Civil Penalty Actions
§ 13.223 Standard of proof.
