Leo,
Last time they called me for jury duty, one of my hearing aids crapped out right in the middle of a lady lawyers presentation, which I'd barely been able to follow anyway because she spoke so softly. Got excused when I kept raising my hand, and asking them to repeat themselves!

After that, I got my hearing doctor to write a letter saying that I was too deaf to follow court testimony, and was even doing good to hear my wife yelling in my ear.
She usually gives up, so that works for me at home, and I haven't been called for jury duty since.

Bill