Is it legal to write a citation when there is evidence proving innocence?

Question Details: Last night, a car which turned out to be an officer was blinding me from behind. I slowed down and merged into a different lane on the four-lane to try to see if they would just drive around me. That is when the lights where turned on and the blinding car became law enforcement. First, he tried to give me a no-insurance ticket when I couldn't find it immediately. Then, after showing the correct documentation, he proceeded to give me a citation for no tag, even though, I, not only, had a valid tag, but I showed it to him because it was in my car. I just hadn't put it on the car yet. The citation says "Expired tag/No tag". That doesn't make sense to me. He wouldn't listen. What would you do?

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