I think the state of Wisconsin is still the worst to work with. We have totally separate tests, the EPA test is pretty easy. For commercial they will not even let you take the test unless you have at least two credits in a recognized tech school. Its really a joke, I have A/C experience and one class with heating and A/C for maintenance men, I trouble shoot them all time, but I cannot crack the system legally. Since I now only work with 512 its not such a legal thing, more of a safety thing as that can make a small fire real nasty real quick.
In any other state I could and have worked with cars, here I cannot. I do have a license to buy or sell Freon or R12, for what ever thats worth, but I cannot actually put it in the system. The legal aspect of it seems to have diminished some, since most of the cars on the roads these days are r134. I do remember when I was working in parts that several dealers in Florida were made examples of by the Feds, back in during the Clinton years. The fines were in the hundreds of thousands of dollars.