Imagine a police officer stopping you at the side of the road. "When was the last time you drank alcohol?" "A couple of months ago at my brother's birthday part

Imagine a police officer stopping you at the side of the road. "When was the last time you drank alcohol?" "A couple of months ago at my brother's birthday party, I had a can of beer." "Step out of the car, you are under arrest for drunk driving." This manichean logic worked wonders last time it was tried.