Metal detectors cannot distinguish between man-made iron metal and the iron-nickel metal of an iron meteorite
If I am wrong on this one I would appreciate be corrected by someone who knows more about metal detectors than I do. Metal detectors may be able to distinguish between U.S. nickel and penny coins, but they cannot tell if piece of metal or a rock contains enough nickel to be a meteorite. Iron meteorites are alloys of iron and nickel that containing 5-30% nickel. Stony meteorites contain only 1% nickel at most. Metal detectors certainly cannot detect the gold and iridium in a meteorite.