If two or more horses in a race are coupled on the same mutuel ticket, there shall be no refund unless all of the horses so coupled are excused before off-time, or all of the horses so coupled are locked in the gate. Discretion is, however, vested in the judges to order a refund wherein a part of an entry in a stake, handicap or futurity is excused before off-time where it is in the public interest to do so. In such an instance the remaining part of the entry shall race for the purse only.
N.J. Admin. Code § 13:71-27.31