§ 2402 Relevant evidence generally admissible - Irrelevant evidence inadmissible.

Here's a plain English summary:

If evidence actually matters to the case, it can generally be used in court. This means facts, documents, or testimony that help prove or disprove something important to the case are allowed to be shown to the judge or jury.

There are some exceptions. Even if evidence is relevant, it might still be blocked if a law, the state constitution, the U.S. Constitution, or another court rule says it can't be used. So relevance is the starting point, but it's not the only thing that decides whether evidence gets admitted.

On the flip side, evidence that has nothing to do with the case can't be used at all. If it doesn't help prove or disprove a fact that matters, courts won't allow it in, since it would just waste time or confuse the issues.