Answer
Only white, sun-bleached tests that are clearly dead and loose in wrack—if still fuzzy or anchored in sand, leave them. Regulations and ethics treat living sand dollars like other live shellfish.
Sources: Town of Ocean City · Maryland DNR
Editorial visitor guidance for Ocean City, Maryland. Confirm current Town of Ocean City, Maryland DNR, NPS Assateague, and NWS rules when regulations or safety apply.
