Maryland Code, Business Regulation § 11-503

(a)(1) Subject to paragraph (2) of this subsection, a licensee shall give preference in stall allocation to a trainer:

(2) A licensee need not allocate more than 60% of the licensee's stalls to trainers who have permanent residences in the State.

(3) A trainer who claims a preferential action under this subsection shall give the licensee an affidavit stating the qualifications and condition of each horse for which the trainer requests a stall.

(b)(1) This subsection applies to trainers who:

(2) The Commission shall seek cooperation among licensees to ensure that, when horses are stabled for a race meeting at a track in the State, consideration is given to assigning a trainer, to the extent practicable and without charge, a stall nearest to the county of residence of the trainer.