this is only a suggestion, but if state and federal agencies that are responsible for these historic sites, would come up with a guideline that would allow individual or organized metal detector people to assist them in finding and locating historic sites and items. much more of our history would come out of the ground to be used in an educational manner other than just rotting in the ground. A simple procedure of a drivers license or some other photo identification along with maybe even an appointed guide to go with the the individual or group could insure that respect and items for the site would be maintained. The results of metal detectors at the little big horn site should be self-explanatory.