Metal detectors are not infallible, some fail to pick up finish nails, or give you false hits. I have a cheapie metal detector I bought at a flea market, said it was for wood workers and it does a good job. I only check logs that look suspicious and then only the butt log. Has anyone tried a strong magnet on a string or the device auto body men use to detect bondo repairs. ?? Alas a new band seems to find metal first. Frank C.