18. Does the car have to be moving for me to be guilty of DUI?

No. You can be arrested for DUI by driving while over the legal BAC limit or while impaired. But, you need not actually operate the car in order to be arrested. You can still be found guilty if you had the capability and power to dominate, direct, or regulate the vehicle, regardless of whether you were exercising that capability or power at the time of the arrest. In other words, simply sitting behind the wheel with the keys in the ignition can lead to your arrest for DUI by being in actual physical control of the car.