Maryland Labor and Employment Section 3-203
§ 3-203.
  This subtitle does not apply to an activity that a minor performs if the activity:
    (1)   is performed outside the school hours set for that minor;
    (2)   does not involve manufacturing or mining;
    (3)   is not a hazardous occupation restricted under § 3-213(c)(1) or (2) of this subtitle for that minor; and
    (4)   is limited to:
      (i)   farm work that is performed on a farm;
      (ii)   domestic work that is performed in or about a home;
      (iii)   work that is performed in a business that a parent of the minor or a person standing in place of the parent owns or operates;
      (iv)   caddying on a golf course;
      (v)   instructing on an instructional sailboat;
      (vi)   delivery of newspapers to consumers;
      (vii)   making an evergreen wreath in or about a home;
      (viii)   work performed as a counselor, assistant counselor, or instructor in a youth camp certified under the Maryland Youth Camp Act; or
      (ix)   work that is performed as an unpaid volunteer in a charitable or not for profit organization, if:
        1.   a parent of the minor or a person standing in the place of the parent consents in writing; and
        2.   for hazardous work in a volunteer fire department or company or volunteer rescue squad, the minor:
        A.   is at least 16 years old; and
        B.   has completed or is taking a course of study about fire fighting or rescue.