I read those posts also and they seem to be in areas where there are meth labs and certain agricultural endevers that are not legal. I've never heard of that beeing a problem here in MI. (We have 4 finds here now! we are hot!) Our first cache, and I've never mentioned this in public before, there was a giant (8 inch) Big Ben alarm clock OUTSIDE the cache but right smack next to it. My son reached for it before I saw it. When I saw it I FREAKED out thinking bomb! 'Back away from the cache!' I poked it with a looooooong stick, then when we didn't blow up we proceeded. And took the clock! LOL
You could post on www.mi-geocaching.org and see if any other of us Michiganders have had an incident. We are a fun group.....come on over!