I read a article about it that says "BrewDog also formed a strategic partnership with US based Stone Brewing for import and distribution." in reference to their Columbus, Ohio brewery. So I'm assuming they just distribute through stone distributors in Ohio whatever that may be, only info I could find on it though. http://www.crowdfundinsider.com/201...d-in-ohio-for-first-brewery-outside-scotland/ though this was relatively recently and I've no idea how long they have had distribution in Ohio so maybe that has nothing to do with it.
Cavalier has them in Indiana and most Cavalier brands seem similar between the two states. That would go along with @justinp444's guess, as Stone is also with Cavalier here.