Md. Code, Health Occupations § 2–314.6

(a) Subject to subsection (b) of this section, a person may not sell or attempt to sell a hearing aid to any person by door–to–door solicitation.

(b) Subsection (a) of this section does not apply to a solicitation that is made:

(1) At the request of the solicited individual; or

(2) In response to an inquiry from the solicited individual.