A ballot is considered 'naked' when it is sent in without a sealed security envelope. Voters also need to be sure to sign the envelope in the marked spot for it to qualify.
"Doing the whole mail in process - it's a bit confusing, so I want to be sure I read all the rules and everything and so it's right!" said Victoria Decesare of Newtown, Pa.
For years, officials counted otherwise valid mail-in ballots even if they didn't have the secrecy envelope. But the Trump campaign challenged that practice, and last month the Pennsylvania Supreme Court ruled that counting naked ballots is a violation of election law.
So far, 2.5 million Pennsylvania voters have requested to vote by mail, democrats outnumbering Republicans by more than 2 to 1.
State Representative Malcolm Kenyatta says the ruling is causing unnecessary stress over this process.
RELATED: Mail-in voting in Pennsylvania: Here's what to know
"This is about whether or not we are going to have a functioning democracy. And I've said to people: if you're not frustrated, you're not paying attention," said Kenyatta.
Pennsylvania to disqualify naked ballots