Md. Code, Labor and Employment § 3-213

(a) Except as otherwise provided in this subtitle, a minor may not be employed or allowed to work:

(1) in, about, or in connection with the manufacturing of a hazardous substance;

(2) in, about, or in connection with:

(i) a blast furnace;

(ii) a distillery where an alcoholic beverage is manufactured, bottled, wrapped, or packed;

(iii) a railroad;

(iv) an engineer, firefighter, or pilot on a vessel that is engaged in commerce; or

(v) a dock or wharf other than a marina where pleasure vessels are sold or served; or

(3) in, about, or in connection with:

(i) the erection or repair of an electrical wire;

(ii) the cleaning, oiling, or wiping of machinery; or

(iii) an occupation that is prohibited by law.

(b) Except as otherwise provided in this subtitle, a minor under the age of 16 may not be employed or allowed to work:

(1) during the school hours set for that minor;

(2) about or in connection with an acid, dye, gas, lye, or paint;

(3) at, about, or in connection with:

(i) an airport;

(ii) a brickyard;

(iii) a lumberyard;

(iv) a workroom or work site where goods are manufactured or processed;

(v) scaffolding; or

(vi) a vessel when engaged in navigation or commerce; or

(4) in, about, or in connection with:

(i) construction;

(ii) an occupation that causes dust in an injurious quantity;

(iii) a manufacturing occupation;

(iv) a mechanical occupation;

(v) a processing occupation; or

(vi) the adjustment, cleaning, or operation of power-driven machinery except:

1. an office machine; or

2. machinery used in a school or government institution as part of vocational training.

(c) The Commissioner may prohibit minors being employed in an occupation if:

(1) after a public hearing, the Commissioner determines that employment in the occupation should be prohibited to minors;

(2) the Commissioner adopts by reference a determination by the United States Secretary of Labor under the federal Fair Labor Standards Act of 1938 that the occupation is hazardous; or

(3) after investigation, the Commissioner determines that the occupation is injurious to:

(i) the health or welfare of minors; or

(ii) the morals of minors under the age of 16 years.