Is Metal Detecting allowed in Maryland State Parks? YES, with permission of Park Manager. See link for time restrictions.
The following can be found at the Department of Natrual Resouces Metal Detecting page found HERE:
A. Digging in search of buried relics or treasures, the removal of any prehistoric or historic artifacts, and the use of metal detectors (except as noted in D, below) within the boundaries of lands, beaches, or under waters controlled by the Maryland Park Service is strictly prohibited without a permit from the Office of Archeology, Maryland Historical Trust, Department of Planning.
D. The only exception to the aforementioned permit requirements shall be for the use of metal detectors in the search for modern coins, jewelry, etc. on all designated swimming beaches operated by the Maryland Park Service, with the exception of Point Lookout State Park and Calvert Cliffs State Park, and all adjacent waters controlled by the Service.
FMDAC Disclaimer: FMDAC assumes no responsibility for any person who knowingly or accidentally violates any state park regulation. Although FMDAC will try to keep this information current we cannot anticipate how each regulation will be interpreted by a specific park department, park employee or other government employee. It is the sole responsibility of each individual to know and obey the regulations of the park or area they are visiting and or metal detecting.