It's deer season in Michigan, which means hunters have headed to the woods, in the hopes of bagging a special treat for the holiday table. Hunting's gotten a little complicated in some areas recently. You might be able to catch something – but that doesn't mean you should eat it. That's because decades ago, a stretch of river in Michigan was polluted with dioxin. In the fourth part of a series on Dow Chemical and dioxin, the Environment Report's Shawn Shawn Allee explores why the state thinks old dioxin pollution from a Dow chemical plant still poses a health risk today.