Maryland election officials plan to use an expanded wireless network during the 2020 elections, prompted by a new law allowing people to register to vote on Election Day. But at least one lawmaker and a local elections board are questioning whether the new system will be worth the cost and will be safe from hackers. A cellular network will transmit new registrations from local polling places to state elections officials throughout Election Day, allowing officials to update voter lists that help meet objectives including that no one vote twice. “It’s creating a path, a road, for the voter check-in data to go from the poll books to our server here,” said Nikki Charlson, the deputy administrator at the Maryland State Board of Elections. She said the step is necessary to enable “local officials to do their research to prepare to count the votes.” Charlson said the only information the network will carry is who is registered and has voted, not how any person voted. The same type of network is used by law enforcement and public safety agencies, she said. “It’s using cellular data, but it’s a secure and closed network,” she said. “No one can find it, and the data’s encrypted, and the network is encrypted.” The state already uses a similar, though smaller-scale, network to upload new registrations during early-voting periods. “So this was taking something we did in early voting and bringing it to Election Day,” Charlson said. But state Sen. Cheryl C. Kagan (D-Montgomery) said the networking equipment, which will cost counties hundreds of thousands of dollars, is not needed and “makes us more vulnerable to hacks and attacks.”