205 C.M.R. 4.30
(1) Officials at a race meeting include the following:
(3) No one interested in the result of a race, either because of ownership of any horse entered, or of his or her sire or dam, or because of bets or otherwise, shall act as a racing official in respect to that race. This prohibition includes, but is not limited to, a restriction on racing officials officiating over races in which any of the following individuals sharing a relationship with the racing official competes: