No. Jury nullification does not mean a jury gets to rule that 'thing X is not illegal'. Rather, it's a jury saying 'I know thing X is illegal (and I can't chan

No. Jury nullification does not mean a jury gets to rule that 'thing X is not illegal'. Rather, it's a jury saying 'I know thing X is illegal (and I can't change that), but I'm going to say that the defendant is not guilty of doing thing X, even though I think he did, because I think thing X shouldn't be illegal'. That may sound like a fine distinction, but it isn't, it's crucial. A legal precedent that X is not a crime means no-one can thereafter get tried for X (where the precedent applies). A jury nullification doesn't have that effect.