informed of this option, but when it was used by juries over and over again in the late 1800s as a way to refuse to convict strikers (which was then illegal - but a juror who believe the law was unjust could refuse to convict the defendant), jurors stopped being informed of the right to nullify.
If you do act under your right to nullify, do so without explaining why.
http://en.wikipedia.org/wiki/Jury_nullificationThe 1895 decision of Sparf v. U.S. held that a trial judge has no responsibility to inform the jury of the right to nullify laws. This decision, often cited, has led to a common practice in United States courtrooms in which juries are instructed to find guilt or innocence according to the letter of the law.
In 2001, a California Supreme Court ruling led to a new jury instruction that requires jurors to inform the judge whenever a fellow panelist appears to be deciding a case based on his or her dislike of a law <6>. However, the ruling could not overturn the practice of jury nullification itself because of double jeopardy: a defendant who has been acquitted of a charge cannot be charged a second time with it, even if the court later learns jury nullification played a role in the verdict