Metal Detectors may NOT by used without written IHT permission (by filing a Research Permit Application) on IHT’s inland Preserves or above the high tide line of Preserves with marine shorelines. The use with permit needs to have scientific or scholarly intent. All holes created through this activity in connection with the Research Permit must be filled. No recreational use is permitted above the high tide line or on rocky shores. Recreational use is permitted on sandy beaches below the high tide line. The rationale for this policy is that the digging (which is the common result of metal detector use) endangers and/or disturbs plants, animals, archaeological and historical remains and the holes are unsightly and are a safety hazard.