(a) To be eligible to be employed as a racing judge, an individual must:(1) have experience as an official at a pari-mutuel greyhound racetrack or demonstrate to the executive secretary's satisfaction that the individual has sufficient experience in a racing-related field to perform the duties of a racing judge;(2) pass an optical examination conducted annually, indicating 20-20 vision, corrected, and the ability to distinguish colors;(3) agree to a complete investigation into the individual's background to ensure the individual's integrity is above reproach;(4) pass a written examination prescribed by the executive secretary; and(5) demonstrate to the executive secretary's satisfaction that the individual's income from sources other than as a racing judge is unrelated to patronage of or employment by a licensee of the Commission.(b) The executive secretary shall administer the written examination required under this section. A passing grade for the examination is 85%.