Maryland Criminal Law Section 8-613
§ 8-613.
  (a)   (1)   In this section the following words have the meanings indicated.
    (2)   "Service" includes the use of telephone or telegraph facilities, gas, electricity, or a musical instrument, phonograph, or other property.
    (3)   "Vending machine" includes a slot machine, pay telephone, or other receptacle designed to receive United States currency in connection with the sale or use of property or of a service.
  (b)   A person may not:
    (1)   operate, cause to be operated, or attempt to operate or cause to be operated a vending machine by a means not lawfully authorized by the owner, lessee, or licensee of the vending machine, including by means of a slug or by counterfeit, mutilated, sweated, or foreign currency;
    (2)   take, obtain, or receive from or in connection with a vending machine any property or service, without depositing into the vending machine United States currency in the amount required by the owner, lessee, or licensee of the vending machine; or
    (3)   manufacture for sale, sell, or give away a slug or device that is intended to be deposited in a vending machine if the person:
      (i)   intends to defraud the owner, lessee, licensee, or other person entitled to the contents of the vending machine; or
      (ii)   knows that the slug or device is intended for unlawful use.
  (c)   A person who violates this section is guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding 3 months or a fine not exceeding $500 or both.