N.J. Admin. Code § 13:71-14.18
Should a horse that has been claimed be scratched prior to off-time, the claim on that horse shall become void. However, should the claimant of the scratched horse wish to continue with his or her claim, he or she may elect to do so by informing the horsemen's bookkeeper prior to off-time of the race that he or she wishes his or her claim to remain in effect despite the horse being scratched. Upon receiving such notification from the claimant, the horsemen's bookkeeper shall immediately inform the judges of the claimant's decision to continue with the claim. Any horse drawn into a claiming race is eligible to be claimed, excepting those horses exempted pursuant to N.J. A.C. 13:71-14.2A. Horses entered in claiming races that have been cancelled by the New Jersey Racing Commission shall not be subject to claims. Any horse entered into a claiming race due to an administrative error shall likewise not be subject to claims.
N.J. Admin. Code § 13:71-14.18