Chatrie v. United States · ¶44

First, Location History provides an even more fine-tuned picture of a person’s movements than CSLI. Carpenter noted that through CSLI records, police could “achieve[] near perfect surveillance” of an individual holding a cell phone. Id., at 311–312. But Location History is nearer perfect still. Here is one way of comparing the two: At any given time, CSLI placed Carpenter within a “sector ranging from one-eighth to four square miles,” whereas Location History pinpointed Chatrie’s location within around twenty meters, which is less than two percent of a mile. Id., at 312; see 1 App. 45, 3 id., at 173–174. Or here is another measure: CSLI logged Carpenter’s location an average of 101 times a day, whereas Location History commonly records a person’s location every two minutes, for a daily average of 720 chartings. See Carpenter, 585 U. S., at 302; 136 F. 4th, at 151 (Berner, J.,…

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