Let's say you have expired tags, and the cop knows it. They can pull you over every time they see you.

You have no grounds for a lawsuit IMO.........

No this is not a conflict. Discuss with your attorney.

Can I get arrested? I was arrested. There is your answer. Now lawyer up.

Taking tags off one car and putting them on another is a crime.

None of us knows the facts of your case. Your lawyer does. Apparently the state doesn't believe your version of events.

This is a Q&A forum. You have not asked a question.

Respectfully, this is not a DIY project. You need to ask your own privately retained attorney.

None of us can predict, but you just admitted to it on an open Internet forum.

I doubt they will, and I doubt it will be worth the expense to sue them.