Three of the four major wireless carriers have been accused of breaking US law by selling 911 location data to third parties.
Around 250 bounty hunters and related businesses had access to AT&T, T-Mobile, and Sprint customer location data.
The documents also show that telecom companies sold data intended to be used by 911 operators and first responders to data aggregators, who sold it to bounty hunters. The data was in some cases so accurate that a user could be tracked to specific spots inside a building.
Carriers misusing this data is a violation of US law, which requires telecommunications companies to protect Customer Proprietary Network Information (CPNI).