Md. Code, State Finance and Procurement § 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.