Uber's Greyball Program Is Under Scrutiny for Blocking Government Stings

  • Startup says program is designed to catch rule-breaking users
  • After aggressive expansion, every move is under a microscope

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An Uber Technologies Inc. program used to counteract government officials attempting to conduct “sting” operations is drawing scrutiny amid a flurry of scandals plaguing the ride-hailing company.

Uber said the effort is meant to enforce violations of its terms of service agreement that customers accept when they sign up to use the app. The company said its prevention program, known as Violation of Terms of Service or Greyball, can be used to block officials.