It’s typically asked about. If you know about it and lie, that’s perjury.
As for "lying" here, it's an interesting metaphysical question. Because you're not lying (or telling the truth) about some observable event, it's simply your own state of mind. If somebody asks "Why did you vote not guilty", you simply say "I didn't believe the evidence was convincing". There is literally no way for anyone else to say otherwise.
Nullification needs to be unanimous. You'd get in trouble when pitching nullification to your fellow jurors. (Or at the very least, have a mistrial declared.)
> people aren't excluded (at least by the judge) for just knowing what the concept is
If you want a surefire way to get off a jury, mention nullification in voir dire. (Hell, just ask innocently about it.)
Nullification absolutely does not need to be unanimous, and it rarely is. All it takes is one juror force a mistrial (and another if it is retried, etc.) Sure, the prosecutor would likely retry, but again, it just takes one juror out of twelve to cause a mistrial, and the vast majority of prosecutors don't prosecute indefinitely.
> If you want a surefire way to get off a jury, mention nullification in voir dire.
No shit, so don't mention it.
...this isn't nullification. A major point of nullification is a not-guilty verdict by a jury is final. No retrial. No appeal.
> the vast majority of prosecutors don't prosecute indefinitely
You think this case wouldn't be re-tried?
I do. The educated, well-to-do, urban bubble has convinced itself—again—that this guy is universally adored. Because we’re mistaking—again—the difference between a symbol and the object, a mistake amplified by those who get their world view primarily from Twitter, Reddit, et cetera.