Hey SkyForUs,
This is a regular topic of discussion, but since you asked for a law enf officer's perspective (retired cop, now lawyer) I'll gladly share what I have before ... we can debate the pros & cons of the law 'till the cows come home, but if it's the law in a person's state one could get a ticket. True, it may not be up there with kidnapping the Lindbergh baby, but a hassle & coslty event nonetheless.
I don't judge those who don't want to ruin their car's looks, but I plan to affix it because I don't want to put any of my former brethren (and sisters) in the position of stopping me. And don't want the hassle. But that's my personal decision.
COULD an officer stop you? Yes. Would they? Some would. Those who "get it" (i.e., car enthusiasts) may be less likely to do so than others, but others sure could ... and they might too; if for no other reason than to see the inside of your Sky (just kidding on that one). LOL; my two cents worth.
Would having it in your turnk suffice? For some, maybe. For a judge? Maybe. Do they have to accept it if it's there or within reach? No, they don't. Would a cop or judge buy that you didn't want to junk up the looks of the car? Hmmmm, I guess maybe.
With my luck I'd be the first one in Minnesota to get the chair for not having it on. As ugly as it is, it's the law here, and so it'll go on. But again, that's just me. If others want to roll the dice, more power to 'em.
Oh, have I stopped people for no front plate, including sports cars? Yup, sure have. Why? Well, it's the law here. Did I write everyone a ticket for it? Well, for that you'll have to read me my Miranda warning first
Scott / Minneapolis