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A comment on FBI agents track cell phones that pinged near the Capitol. Parent comment

Re:FBI agents track cell phones that pinged near the Capitol by everdrive on Saturday January 23, 2021 @04:00PM (#25886035)
Are these methods actually used by police, or are these speculations based on the sort of inferences police could draw?
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Re:FBI agents track cell phones that pinged near the Capitol by systemvoltage on Saturday January 23, 2021 @04:10PM (#25886125)
I am also wondering the same. Would be great if the OP would provide some sources around this.
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