When you wear Fitbit or any other fitness tracker and smartwatch, you not only monitor your physical activities, you also collect data about yourself — data that can apparently be used against you in investigations. In Lancaster, Pennsylvania cops responded to a 911 call by a woman who claimed she was raped by a home invader. The woman told the police she woke up around midnight with the stranger on top of her, and that she lost her tracker while struggling against her assailant. Unfortunately authorities found her Fitbit, and the device recorded her as active, awake and walking around all night. Combined with the evidence that was missing (tracks outside in the snow from boots she said the attacker was wearing, or any sign of them inside), an investigation led to her facing misdemeanor charges.
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https://www.engadget.com/2015/06/28/fitbit-data-used-by-police/