Needing to check the camera
The driver he was writing up became even more incensed with Davis as a result of receiving a ticket while the officer was letting the driver who had just sped past them go. As soon as Davis finished speaking, he handed him his ticket. He was eager to quickly check his high-speed camera.
Not seeing much
Just a few seconds after passing him, the car vanished from view, and he was unable to get a picture of the license plate. The only thing he could make out about the car was that it appeared to be expensive and was entirely painted white. But perhaps he could learn more from his camera.