Enforcing Montana’s statewide mask mandate is part of supermarket manager John Steenwyk’s job. It puts him in the crosshairs of anti-maskers, and while he tells them a lot of things to convince them to wear masks, there’s one thing he won’t say to them, even though he could.  CNN Senior Writer Thomas Lake tells the story of a battle over masks playing out in a grocery store at the edge of Yellowstone National Park. 

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