Private companies have developed wireless surveillance systems capable of tracking anyone with a mobile phone anywhere in the world, and governments across the globe — including the U.S. — are already customers.

Unidentified company employees “concerned that such systems are being abused” told The Washington Post the systems track cellphone users by pulling detailed records and information — including location data — from global cellular networks. The systems are capable of following users from country to country and hiding their surveillance presence from both phone owners and service providers.

Numerous governments around the world have already purchased or leased such systems and software, which can secretly collect records and follow users’ movement for days, weeks or even longer.

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