Because you mentioned it, I went and looked it up. I think what you are thinking about is that there is one place in Montana that is currently in the news because trace amounts of asbestos were found in a wood chip pile.
They do not know how it got there, but it is some kind of contamination. It is NOT something that is typically added to wood chips or anything else, being illegal to use and closely monitored.
Don't go around scaring people about rumors.... there's way too much "be afraid . . . be afraid" out there. No reason to be afraid of your wood chips.