I’d have to say Jury Nullification would be one and especially so because mentioning it or admitting that you know of it can get you pulled off an American jury.

It’s the idea that even if a person is brought to trial and is guilty of an action that is legitimately classified as a crime, if you and your fellow jurors disagree, you can still find the plaintiff “not guilty”.

For example: marijuana is illegal on the federal level and some state levels and if someone were in court on charges of possession of marijuana and nothing more, regardless what the law says or how the judge feels, you and your jurors can vote to find this person innocent so they don’t face the legal consequences for possession.

Teaching crabs to read