Nullification is basically when a jury says that the law itself isn't fair instead of turning in a guilty or innocent verdict, and was used more commonly during times such as the revolution and during the time when slavery was still legal.  For example a jury ruling on a slave who was caught after escaping might refuse to persecute even if he was guilty of the crime

Nowadays the American legal system tends to disallow people whom know about it to even serve on juries if they can help it and rarely if ever tell the juries they have the right to do so.

What do you think about it?

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I have a chip in my forehead that heats up when I talk to idiots...
Right now its burning a hole through my skull.