Md. Code, Transportation § 23–206.4

(a) In this section, “zero–emission vehicle” means any vehicle that:

(1) Is determined by the Secretary to be of a type that does not produce any tailpipe or evaporative emissions; and

(2) Has not been altered from the manufacturer’s original specifications.

(b) A zero–emission vehicle is exempt from the mandatory tests and inspections required by this subtitle.

(c) The Administration and the Secretary shall adopt regulations necessary to:

(1) Provide for the determination of which vehicles are zero–emission vehicles; and

(2) Implement the provisions of this section.