How can driving while impaired be proven?

• By proving the driver's physical or mental fitness is impaired by alcohol or drugs
• By proving the driver's blood alcohol concentration is 0.08 percent or more
• By proving the driver's alertness and confidence is increased
• Both A & B
  Explanation:

  "Driving while impaired can be proven in one of two ways: 1. By proving the driver's physical or mental fitness is appreciably impaired by alcohol, drugs or a combination of both. 2. By proving the driver's blood alcohol concentration is 0.08 percent or more, or 0.04 or more if you are driving a Commercial Motor Vehicle."