I’d check the cheese ~ sometimes folks just simply forget how much alcohol can collect in cheese ~ it’s fatty and airtight so it doesn’t evaporate.
I will accede to you on that point, as it is not one with which I have experience. I do know I wasn’t eating any booze/cheese concoctions that night.
But that is neither here nor there, my point was, and remains, the breathalyzers are VERY far from infallible.