Here in Northern California, every 6 foot or deeper new excavation requires the presence of a Native American representative on site to be certain that any bones or bone fragments found are not disturbed. Law on the books for twenty years or so. Local golf course rerouting drainage presently waiting for bone fragment analysis at a lab.
Similar here in Wisconsin. We have a cell phone tower on our farm, and one of the first questions the tower company asked was whether or not we had ever found an arrowhead on the entire place. If so, no need to talk any more. Acquiring required permits, etc., was just astonishing.