Md. Code, State Fin. & Proc. § 17-215

(a) Each contractor and subcontractor subject to this subtitle shall pay each employee not less than the prevailing wage rate required under this subtitle: (1) unconditionally; (2) without subsequent rebate; and (3) except as provided in subsection (b) of this section, without deductions for: (i) food; (ii) sleeping accommodations; (iii) transportation; (iv) use of small tools; or (v) any other thing of any kind. (b) A contractor or subcontractor may make deductions that are: (1) required by law; (2) required or allowed by a collective bargaining agreement between a bona fide labor organization and the contractor or subcontractor; or (3) contained in a written agreement between an employee and an employer undertaken at the beginning of employment, if the agreement: (i) concerns food, sleeping accommodations, or other similar items; (ii) is submitted by the employer to the public body awarding the public work contract; and (iii) is approved by the public body as fair and reasonable.