My brother recently purchased a Bounty Hunter metal detector, yet is unsure if it is legal or not to use it on State Land. Anyone on that knows the ropes about use of metal detectors in Michigan? Gold Duster, Dave.
But if you meant just state land (idle roadsides, etc...) then turn your question around the other way: Why would you think you can't? If there's no specific prohibition, then why wouldn't you be able to? The state no doubt has a website, with their codes, laws, etc.... on there. Simply go there and type in "metal detectors" in the word search box. If it's silent on the issue (for non-park-managed land), then so be it, it must not be prohibited, right?