We have to assume not until/unless a lawyer shows up and says otherwise.
Rumors to the contrary, we do have a right to free speech, so you can say anything you want in a courtroom without being arrested, unless it causes immeidate danger (e.g. yelling "FIRE!").
When jury selection happens, I have heard that you can be rejected from being on the jury if you say (essentially) that you don't agree with the law. Not agreeing with the law is precisely what leads to jury nullification.
Good point. And I'm sure if the court is in session, talking out of turn about anything (including jury nullification) would get you held in contempt of court.
So, saying you'll be arrested for talking about jury nullification in court doesn't really give an accurate picture. Though it is probably technically true.
Rumors to the contrary, we do have a right to free speech, so you can say anything you want in a courtroom without being arrested, unless it causes immeidate danger (e.g. yelling "FIRE!").
When jury selection happens, I have heard that you can be rejected from being on the jury if you say (essentially) that you don't agree with the law. Not agreeing with the law is precisely what leads to jury nullification.