Rule 1302 When the liability, obligation, or duty of a third person is in issue in a civil action, evidence of a final judgment against that person is not made …

If someone else's responsibility for something is being debated in a civil lawsuit, a court can consider a final judgment that was already made against that person.

For example, if you are suing a company and part of your case depends on proving that a third party did something wrong, a previous court judgment finding that third party liable can be used as evidence. The normal rule that blocks hearsay evidence does not apply in this situation.