How impaired must a defendant be for there to be a presumption under Florida law that the defendant was negligent?

The legal alcohol presumption is 0.08.

I think most people have heard that 0.08 and you’re legally intoxicated in the state of Florida. That information can be used against you in a trial.

But how impaired do you have to be to be negligent? To be making a mistake? That can be any number.