Ultrasonic Tracking: Are our phones really listening to us?
Twenty Thousand Hertz
How the FTC Protected Ultrasonic Tracking in the US
The FTC warned apps against Silver Push, which provides ultrasonic tracking in retail stores. Researchers at Yale Privacy Lab found eight Android apps that still use Silver Push. Most of them are international and outside the scope of US law. In recent lawsuits against ultrasonic tracking providers, the wiretap act has been referenced.
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