San Francisco District Attorney George Gascon, at podium, answers questions while standing with members of his staff and the Los Angeles District Attorney's office during a news conference about the ridesharing companies Uber and Lyft Tuesday, Dec. 9, 2014, in San Francisco. California prosecutors have filed a lawsuit against Uber over the ridesharing company's background checks and other allegations, adding to the popular startup's worldwide legal woes. Meanwhile, Gascon said Tuesday that Uber competitor Lyft has agreed to pay $500,000 and change some of its business practices to settle its own lawsuit. (AP Photo/Eric Risberg)