I've only done state court jury duty and closest I got was when they filled the seats and started asking people in the box the questions and eliminating people and filling the spots with people in the surplus pool that got to watch the jury get questioned (I was in the surplus pool watching the voire dire).
Sometimes they don't give you the chance to announce your opposition. There are questions to the entire jury to see if you know the defendant or plaintiff and company involved if it's civil, the person that raises their hand to a mass question gets asked a bit more to see how much you know or how close to parties you are. If you do get the chance, then the judge will keep asking you questions to see if despite your statement that you can still listen to the evidence and be fair in your decision. The thrill of thinking you can get out of trial soon dies. What I saw that seemed successful in CA to get out of a long trial was people whining about how they need to go to work to support their family because their work doesn't pay while they are on jury duty or they are a caretaker and it would be a harship. Or medical issues.
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