Proof/logic for this problem

1. (8 points) A driver is in court for a speeding ticket. You are there too (for unnamed reasons), and overhear the following: Prosecutor: if the defendant is guilty, then he was not alone in the car. Defense Attorney: That's not true. Prosecutor: Aha! So you admit he is guilty ther! The jurors are puzzled, but the judge agrees. What about you? Use logic to show that the Defense Attorney's statement can be used to show that the driver is guilty