[magduf]

I'm fairly sure they can't do that after the trial has started.

Basically, yeah, if you admit to the attorneys at the beginning (during "jury selection") that you'd do this, then yes, they'd use this to make sure you don't get on the jury, because you're obviously biased.

But if you lie or keep your mouth shut and get on the jury, and then during deliberations you bring this up only among other jury members that you don't believe anything the CIA says, I don't see how they can boot you from the jury at that point. Most likely, it would result in a mistrial due to hung jury.