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A hot potato: A federal case in Atlanta is raising questions about a privacy-focused mobile operating system, with prosecutors arguing that its features were used to erase evidence. The US Department of Justice is attempting to prosecute Atlanta resident Sam Tunick under a federal statute that makes it a crime to destroy property in an effort to prevent it from being seized.

The case centers on Tunick's use of GrapheneOS , an open-source operating system that works on Google Pixel phones and lets users enter a passcode to wipe a device clean.

Experts said the legal approach is unusual and may be the first time the law has been aimed at an operating system. "It's concerning – and sends the message that [GrapheneOS] is criminal by default," said Christophe Boutry, a cybersecurity and surveillance expert.…