State Park Metal Detecting Rule and Regulation Detail:There is no specific law against use of metal detectors. However, they may not be used for mineralogical or historical / archeological collection.
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Metal detecting is prohibited in National Parks and also on many public lands including city and state parks. Be sure to check the regulations before you dig.
Collecting, rockhounding, and gold panning of rocks, minerals, and paleontological specimens, for either recreational or educational purposes is generally prohibited in all units of the National Park System (36 C.F.R. § 2.1(a) and § 2.5(a)). Violators of this prohibition are subject to criminal penalties.