Maryland Code, Public Safety § 14-1302

(a) Except as provided in subsection (c) of this section, during a state of emergency, in the geographic area covered by the state of emergency declaration, a person may not sell or offer to sell goods or services designated as essential by the Governor for a price of 15% or more above the highest price at which the person made actual sales or rentals of those essential goods or services between:

(b) Except as provided in subsection (c) of this section, during a state of emergency and for the 90 days following the end of the state of emergency, a person may not sell or offer to sell repair or reconstruction services used for emergency cleanup for a price of 15% or more above the average price charged by the person for those services during the 30 days before the state of emergency.

(c) A person may increase a price by 15% or more for goods and services if the person can prove that:

(d) At least 20 days before an action is filed under § 14-1303 of this subtitle, the Office of the Attorney General shall provide a person whose actions may be in violation of this section notice of the general relief sought by the Office of the Attorney General to give the person an opportunity to present evidence that the price increase was in accordance with subsection (c) of this section.