That's why lawyers strike them from ALL juries - civil, criminal, probate, you name it.
I wound up on a jury even though I'm a former insurance defense lawyer - just because it was such a bad pool that the lawyers said (in the post trial de-briefing, when I asked them, "What the )*(&(*%* were you THINKING?") that there were other folks they needed to get rid of a whole lot worse than they needed to get rid of me. Unemployed still living with parents, young college students, goofy hippie types, elderly hard-of-hearing, immigrants with questionable command of English, etc. etc.)
My late husband, on the other hand, was practically a professional juror. He got called 10-12 times over his lifetime, selected every time, elected foreman all but once (he said the guy in the suit really wanted to be foreman, so he deferred to him.) He really was a steady-looking fellow, long-time employee of a small company, technical background, unflappable. Everybody wanted him on their jury.