Next month, New Jersey residents will head to the polls to cast their votes for the state's next governor. But election watchdogs are warning that New Jersey voting machines on are at high risk of cyberattack—and it would be simple for a hacker to manipulate results without a trace.

As Aaron Sankin reported for Reveal, New Jersey is one of only a handful of states to use voting machines that don't use paper ballots as a backup in case its digital systems fail. Without a verifiable paper trail, election officials might never know if the machines have been compromised.

"If someone writes their vote down on a piece of paper, that's a thing that's hard to hack," Sankin told WNYC's Jami Floyd. "When it comes to the overall security of the election, there is a general consensus that paper ballots are superior."