You are allright to have PE after your name if the address on your business card is the state in which you are registered. I am registered in Montana and Texas. I have my business cards with our Montana address-- that works. However, If I were to have new business cards for work we do in another state, say Oklahoma and am not registered in Oklahoma, then that is a rule violation and you could get in trouble.
I actually had that happen when I came to Montana. I think I knew that rule, but did not pay attention to it. I had new business cards made for another job that I had with PE on them. Somebody turned me in to the Montana board. I got a "cease and desist" letter. I solved the problem by becoming registered in Montana.--- no further problems. This is attention to detail --- and sadly, I did know it. I just failed to pay attention. At the end of the day, all worked out OK, however, some embarrassment in the middle. Sheer buffoonery on my part! NO EXCUSE for buffoonery.