system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What exactly is jury nullification?
gpt
**Note, this is not legal advice and the contents of this comment may prevent you from serving a jury duty. Approach it as purely educational and nothing more**

Jury nullification is the phenomenon when a jury's verdic is in direct opposition from it's opinion. For instance if all evidence points to the person on trial being guilty without doubt, but the jury still states he is innocent despite what their opinions are.

it is a logical result from two laws that make juries work:

* A jury cannot be punished for any decision they make in jury
* A defendant cannot be put on trial again for the same crime.

The resulting clause is thus that a jury can veto the court without being punished and without regards to evidence and the defendant cannot be put back on trial to negate the nullification.

A piece of advice: Going into a trial with the intent of nullifying is a definite "nono" which is why you're never told that this is an option. When you're about to enter the jury you're usually asked the following question:

*"Do you have any beliefs or opinions that may infer with your ability or actions while in court." (A.k.a will you try and nullify or do something not lawful?)*

If you answer "Yes" you're off the court.
Answer "No" and you lied under oath, a federal felony, and are risking  imprisonment. 

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For more information refer to CPGgray's video on the topic.