'Geofence warrants are also known as “reverse-location” warran | OTAS: operational thinking against the state

"Geofence warrants are also known as “reverse-location” warrants, since they seek to identify people of interest who were in the near vicinity at the time a crime was committed. [...] According to the data, Google received 982 geofence warrants in 2018, 8,396 in 2019 and 11,554 in 2020. [...] The data shows that the vast majority of geofence warrants are obtained by local and state authorities, with federal law enforcement accounting for just 4% of all geofence warrants"

https://techcrunch.com/2021/08/19/google-geofence-warrants/