Maryland Code, Insurance § 19-518

(1) a charitable organization, as defined in § 6-101 of the Business Regulation Article, in the State; or

(2) a not-for-profit organization in the State that is exempt from taxation under § 501(c)(3), (4), or (6) of the Internal Revenue Code.

(1) cancel the policy of a named insured or refuse to issue the policy to an applicant solely because the named insured or applicant is a volunteer driver; or

(2) impose a surcharge on or otherwise increase the rate for the policy solely because the named insured or applicant, a member of the named insured's or applicant's household, or an individual who customarily operates the named insured's or applicant's motor vehicle is a volunteer driver.