Maybe look up laws or articles on the law in your state as it pertains to body armor. States might differ. I’m not in MI, but I read that one state law goes — that since you are not committing a crime, it is legal to wear.
Who decides if you are committing a crime? You guessed it, the courts. For me, it was a “no brainer”, and crystal clear. I am not a criminal, I do not plan to be, if I ever have to use lethal force, it will be in self defense of my life, again, not committing a criminal act, so yes, I will wear it if and when I want with never a legal worry ever. Why?: I simply weighed it on a scale, on one hand, I do not wear the vest, get stabbed or shot and we all know the consequences to that injury; On the other I wear the vest, not get hurt, live, and take some low chance to zero chance of being found guilty of committing a crime while wearing a vest (low chance in my case).
To me, there is a population who I humbly guess the vest laws apply to, and I am not one of them, and that is for criminals, planning to commit a crime, and wear such a vest. Not only are they committing the crime they planned, but a second crime by wearing that vest.
Don’t trust me, check it out. Good luck. 
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