Ouch! Court has heard alot of reasons i,m sure. Time and money to go enter a plea, were i to be in your position i have the time. My plea would be guilty with a reason. Regulations do need to change but need to be clear as well. Not knocking Michigan regulations(to hard). But have had to explain disabled regulations to a few raised eyebrows.
Here our tags are electronic and my opinion is if its not allowed to be purchased don,t allow it.
Will they reimburse the tag you shouldn't,t have acquired? Which in your case of tagging does with either sex their in essence making more money than buying one of each(if allowed).
Not going to help but i can understand the confusion with some regulations.