Maryland Code, Transportation § 22-103

(a) In order to assure that required devices displayed for sale, sold, offered for sale, or delivered for use in, on, or as a part of the equipment of a motor vehicle, trailer, semitrailer, or pole trailer are of a type approved by the Administrator, the Administration may maintain a program of market surveillance.

(b) On discovery of unapproved devices being sold, offered for sale, displayed for sale, or being delivered for use on any of the vehicles described in § 22-101(c) of this subtitle, notice shall be given that the seller, jobber, or wholesaler is in violation of § 22-101 and that these unapproved devices may not be sold, displayed for sale, or delivered for use on any of the vehicles described in § 22-101(c) and that any such sale, offer for sale, display for sale, or delivery for use of any unapproved devices is a violation of this title.