(a) Any person who is a Federal or State employee, the employee of a local jurisdiction, or the employee of a cooperating agency possessing proper qualifications as determined by an examination for competency and who is to perform grading service under this part may be licensed by the Secretary as a grader.

(b) All licenses issued by the Secretary shall be countersigned by the officer in charge of the poultry grading service of the AMS or any other designated officer of such Service.

(c) Any person who is employed by any official plant and possesses proper qualifications as determined by the Administrator may be authorized to grade poultry and/or rabbits on the basis of the U.S. classes, standards, and grades under the supervision of a grader. No person to whom such authorization is granted shall have authority to issue any grading certificates, grading memoranda, or other official documents; and all products graded by any such person shall thereafter be check graded by a grader.