DES MOINES, Iowa (AP) — Iowa bartenders and police want to know more about how the state's new digital driver's licenses will work when the licenses reach smartphones next year.

Officials haven't yet explained how bars and retailers will be able to verify the ages of customers when they want to buy alcohol, the Des Moines Register reported .

Mark Stringer, executive director of the American Civil Liberties Union of Iowa, said he wants to know more about what limits will be in place to keep officers from searching someone's smartphone while they look at the digital license.

"We don't have a firm position on this topic because we have yet to be presented with a sufficient amount of detail to analyze the proposal in light of the specific technology intended," Stringer said.

State Transportation Director Mark Lowe said the questions about the new licenses should be addressed before they debut around the middle of next year. He said the development plan will include input from police and retailers. But for now, Lowe said, the project isn't ready for such input.

"That's likely why they are not yet certain how they will interact with it — we're just not there yet," Lowe said.

Digital driver's license holders will also be issued a plastic license.

"If all else fails, you still have that," Lowe said.

Iowa was among the first states in the country to explore digital driver's licenses as an alternative to traditional plastic licenses. At least nine other states are now considering the concept.

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Information from: The Des Moines Register, http://www.desmoinesregister.com