7 Pa. Code § 205.413 – Placing of breaking horse by Judges.

(a) The Judges, may in their discretion, set back a breaking horse at the finish when a contending horse properly on its gait is lapped on the hind quarter of the breaking horse. Except, if the breaking horse was off stride due to interference.
(b) Any horse making a break which causes interference to other contending horses may be placed behind all offended horses.
(c) If, in the opinion of the Judges, a driver of a horse on a break reasonably complies rule in subsection (b), no fine or suspension shall be imposed on the driver.

This section cited in 7 Pa. Code § 205.415 (relating to calling and noting breaks).