In Florida they do it by drivers license not voters registration. Which makes it much more fair as so many people don't register to vote. But then, they do get all the people that can't serve either doing it by license. But it gives them a much broader pool to select from.
I think you can still get out of it if you are a stay at home mom in some states and if you are over 70. Heck, my experience in Florida was that all the retirees WANTED to serve Jury Duty. They had nothing else to do.