Md. Code, Environment § 6–905.1

(a) Except as provided in subsection (b) of this section, a marketer may not sell or provide a fever thermometer containing mercury to a consumer except by prescription.

(b) This section does not apply to:

(1) A fever thermometer sold or provided to be used in hospitals or other places where medical services are provided by medical service professionals; or

(2) A digital thermometer using mercury-added button cell batteries.