Maryland Code, Commercial Law § 14-2202

(1) Made in accordance with prior negotiations in the course of a visit by the consumer to a merchant operating a retail business establishment which has a fixed permanent location and where consumer goods are displayed or offered for sale on a continuing basis;

(2) In which the person making the solicitation or the business enterprise for which the person is calling:

(3) Which is covered by the provisions of Subtitle 3 of this title;

(4) In which:

(5) In which the consumer purchases goods or services pursuant to an examination of a television, radio, or print advertisement or a sample, brochure, catalogue, or other mailing material of the merchant that contains:

(6) In which the merchant is a bona fide charitable organization as defined in § 6-101 of the Business Regulation Article.

(1) The consumer is required to call a telephone number;

(2) The consumer is charged a separate toll fee for the call; and

(3) The person making the solicitation receives any portion of the separate telephone toll fee paid by the consumer.