Ordinary cab drivers can do this, too. I expect Uber will start screening its drivers for criminal records.
All Uber ridesharing and livery partners must go through a rigorous background check. The three-step screening weve developed across the United States, which includes county, federal and multi-state checks, has set a new standard. These checks go back 7 years, the maximum allowable by the Fair Credit Reporting Act.
http://blog.uber.com/driverscreening