This is probably one of the best reasons NOT to avoid jury duty.
Judges have found jurors in contempt of court for nullification attempts.
http://www.progress.org/drc07.htm
<snip>"The 62-page appellate ruling was based not on whether nullification had been used, but whether allowing jurors to testify about conversations that took place during jury deliberations violates the sanctity of those deliberations. "You can't use evidence of juror deliberations in a court proceeding," explained Eugene Volokh, a constitutional law professor at the University of California at Los Angeles. "Certainly, this is something that encourages jurors to be as candid as possible during the proceeding."<snip>