Customers who try getting into an Uber without a face mask will have to prove they have their mouths and noses covered if they want a ride in the future, the ride-hailing service said on Tuesday. It cited medical experts in stating that wearing a mask can slow the spread of COVID-19, which has killed more than 180,000 Americans to date. Should a driver report a passenger not wearing a face mask during a ride, the Uber app will require that person send a selfie of themselves wearing a facial covering before they can call an Uber again, the San Francisco company said.