This Wednesday, March 1, 2017, photo shows an exterior view of the headquarters of Uber in San Francisco. Uber has been wielding a secret weapon to thwart authorities who have been trying to curtail or shut down its ride-hailing service in cities around the world. The program included a feature nicknamed "Greyball" internally that identified regulators who were posing as riders while trying to collect evidence that Uber's service was breaking local laws governing taxis. The New York Times revealed Greyball's existence in a story published Friday, March 3, 2017, based on information provided by four current and former Uber employees. (AP Photo/Eric Risberg)
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