So if you get pulled over and are identified as being an illegal immigrant and have a license for one of the states, you could be given a ticket for driving without a license. The question is, how could they know that you are an illegal immigrant?
That's just it right there. I don't carry my birth certificate with me! We don't have "papers" so how's this going to work? Not to mention the huge swath this opened wide for an easy way to profile anyone, search the car, etc.
Like the cop has sniper optics scanning each car for your out of state plate. Don't drive like an idiot and most people would never notice your plate.
Also I'd be wary of anything that the "political science professor at Hamline University" says...
“A state must honor and respect laws from other states,” he notes. “I get married in Minnesota, I travel down to Florida, does Florida have to recognize my marriage? Yes, it does. I don’t have to get remarried down there.”
This is a well known problem for those who have a common law marriage. They're often no recognized in states that don't support the practice.