Maryland Code, Agriculture § 13-204

(1) Keep grain records showing the amount of grain bought, received, exchanged, or stored in the dealer's grain business;

(2) Keep grain records at each place of business or at a central location within the State;

(3) Keep grain records for 3 years; and

(4) Make grain records available to the Secretary upon request.

(b)(1) If the Secretary reasonably believes that a person is acting as a grain dealer, and refuses to make business records available upon request, the Secretary may subpoena the business records of that person.

(2) If a person fails to comply with a subpoena issued under this section, on petition of the Secretary, a court of competent jurisdiction may compel obedience to the subpoena and the production of business records.