Maryland Code, Agriculture § 10-704

(a) No standard, grade, rule or regulation adopted under this section affects the right of any person to sell his fruit or vegetable without conforming to it.

(b) However, no person may mark any fruit or vegetable, or container in a manner that indicates that the fruit or vegetable conforms with any standard or grade of the Secretary, unless the person conforms with all rules and regulations adopted under this subtitle.