I'm not exactly sure how Michigan's Duty of Care LAws works [[it's similar to California's Multi-Factor Test, but with a few modifications), however, as a general rule, as long as the owner has a sign alerting trespassers of how dangerous the property is [[MAtty Moroun has placed several of these signs around the property), the property owner has no duty to them.
One thing's for sure however, the property owner doesn't have any STRICT liability if the trespasser is an adult.
http://en.wikipedia.org/wiki/Trespasser
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