Mass. Gen. Laws ch. 149, § 72: Badges; wearing; transfer; exhibition; regulations for issuing

Section 72. The badge shall be worn, conspicuously exposed at all times, by such boy or girl while so working. No boy or girl to whom said badge has been issued shall transfer the same to any other boy or girl. Said boy or girl shall exhibit the same upon demand at any time to any officer mentioned in section seventy-seven. The school committee of any city may make further regulations and requirements for issuing such badges.