01-017-7 Me. Code R. § 60
When any horse breaks from its gait in trotting or pacing, the driver shall, as soon as clearance exists, take the horse to the outside or inside where the most clearance exists and pull it to its gait and lose ground. Committing an extended break, or failure to take the horse to the outside or inside where clearance exists, or to properly pull the horse to its gait, or to lose ground as a result of a break is a violation of this section.
If the driver fails to take appropriate action as required by this section, he or she is subject to disciplinary action as provided in Chapter 17. In addition, the Judges shall set the horse back one or more places, as appropriate.
If there has been no failure on the part of the driver in complying with this section, the horse shall not be set back unless a contending horse on his or her gait is lapped on the hind quarter of a breaking horse at the finish.
01-017 C.M.R. ch. 7, § 60