The program, known as Data Analytical Services (DAS), has for more than a decade allowed federal, state and local law enforcement agencies to mine details about the calls Americans make, including analyzing the specific phone records of people who are not suspected of any crime, including victims.

We learned about this secret spying program from a letter that was recently sent by U.S. Sen. Ron Wyden (D-Ore.) to the Department of Justice (DOJ) challenging its legality. DAS is especially concerning because it utilizes a technique called chain analysis that targets not just people who directly call a criminal suspect but also others with whom these same people may have been in contact.

https://www.newstarget.com/2023-11-24-police-access-trillions-us-phone-records-surveillance.html?