In May 2015 about 10 investigators for the Quebec tax authority burst into Uber Technologies Inc.’s office in Montreal. The authorities believed Uber had violated tax laws and had a warrant to collect evidence. Managers on-site knew what to do, say people with knowledge of the event.

Like managers at Uber’s hundreds of offices abroad, they’d been trained to page a number that alerted specially trained staff at company headquarters in San Francisco. When the call came in, staffers quickly remotely logged off every computer in the Montreal office, making it practically impossible for the authorities to retrieve the company records they’d obtained a warrant to collect. The investigators left without any evidence.

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Prosecutors may look at whether Uber obstructed law enforcement in a new light. “It’s a fine line,” says Albert Gidari, director of privacy at Stanford Law School’s Center for Internet & Society. “What is going to determine which side of the line you’re on, between obstruction and properly protecting your business, is going to be things like your history, how the government has interacted with you.”