Pennsylvania's long-running dispute over the requirement for voters to write accurate dates on the exterior envelopes of mail-in ballots has returned to the courts. Judges are hearing arguments on a lawsuit over whether this mandate should be upheld, as advocates argue that it unfairly leads to the disqualification of otherwise valid votes. The technical requirement has been a contentious issue, with opponents claiming it disenfranchises voters. The case was brought before a Pennsylvania appeals court on Thursday, highlighting the ongoing legal battle over mail-in voting regulations in the state.