I was called for jury duty once, and had to get out of it because I was homeschooling my then-elementary school children. Apparently, homeschooling is not a valid excuse (so what do I do with my very young children while on the jury? Who teaches them?)
My father knew a congressman, and he sent me to talk to him. He asked me if I had ANY medical condition which could prevent me from serving, and I mentioned my hearing impairment which I have had since age 6. He asked if my dr would validate it in writing, and I said yes.
Once my otolaryngologist sent me the letter stating I have moderate to severe bilateral hearing loss in both ears which is incurable, I've never gotten a call since. I save the letter to make copies in case I do get called again.