Maryland Business Occupations and Professions Section 4-605
§ 4-605.
  (a)   Except as provided in §§ 4-301.1 and 4-301.2 of this title and subsection (b) of this section, a person may not practice barbering in any place other than:
    (1)   a barbershop that holds a barbershop permit under this title; or
    (2)   a beauty salon that holds a beauty salon permit under Title 5 of this article.
  (b)   A licensed master barber or a licensed barber may practice barbering outside a barbershop or beauty salon if:
    (1)   the master barber or the barber is sponsored by a barbershop that holds a barbershop permit or a beauty salon that holds a beauty salon permit;
    (2)   the patron is a customer of the barbershop or the beauty salon;
    (3)   the implements transported to the site where barbering services will be performed are sanitized and disinfected;
    (4)   the sponsoring barbershop maintains complete records of all services performed outside of the barbershop or the beauty salon; and
    (5)   Board inspectors are permitted to conduct inspections of:
      (i)   the implements used outside of the barbershop or the beauty salon; and
      (ii)   the premises where the barbering services are performed.