Rule 355 When evidence is admissible as to one party or for one purpose and is inadmissible as to another party or for another purpose, the court upon request …

Sometimes a piece of evidence is allowed in court for one reason but not another. For example, a statement might be used to show someone knew about a problem, but not to prove the problem actually happened.

When this situation comes up, a party can ask the judge to give the jury special instructions. The judge must then tell the jury exactly what they can and cannot use that evidence for. This helps make sure the jury only considers the evidence in the right way.