9 C.F.R. § 73.1c
For purposes of this part the following terms shall have the meaning set forth in this section.
Administrator. The Administrator, Animal and Plant Health Inspection Service, or any person authorized to act for the Administrator.
Animal and Plant Health Inspection Service. The Animal and Plant Health Inspection Service of the United States Department of Agriculture (APHIS or Service).
APHIS Inspector. A veterinarian or livestock inspector employed by the Animal and Plant Health Inspection Service, U.S. Department of Agriculture, in animal health activities, who is authorized to perform the function involved.
State Inspector. A veterinarian or livestock inspector regularly employed in animal health activities by a State or a political subdivision thereof, authorized by such State or political subdivision to perform the function involved under a cooperative agreement with the U.S. Department of Agriculture.
9 C.F.R. §73.1c