Maryland Code, Natural Resources § 4-1204

(a) If a Natural Resources police officer or any law enforcement officer has probable cause to believe that any fish or device is possessed, in violation of this title, and it is not possible or feasible to secure a search warrant in time to seize the fish or device, then he may examine without a warrant any boat, railway car, box, crate, package, or game bag.

(b) In this event, a Natural Resources police officer, in uniform or accompanied by a uniformed police officer, may stop and search an automobile, any vehicle, or trailer for the purpose of examining the fish bag. He also may determine whether the person has an appropriate license.

(c) However, this section does not permit entering a dwelling house without first procuring a search warrant.