I've lived in the Miami area and diesels have always been exempt since I started driving (1992). I don't think Palm Beach County was on the EPA's SH*T list like Dade and Broward were and I don't think they even had emissions testing.
In any case, I'm almost 100% sure there is no emissions testing now in Palm Beach and I'm 100% sure there is no testing in Miami-Dade.
Cops are usually pretty lenient about the tinting down here due to the heat, but searching the crappy Florida DMV website is fruitless. I'm not sure how the heck you'll find an answer in writing . . .
I guess you're moving down to S. Florida too