A surveillance program now known as Data Analytical Services (DAS) has for more than a decade allowed federal, state, and local law enforcement agencies to mine the details of Americans' calls, analyzing the phone records of countless people who are not suspected of any crime, including victims. Using a technique known as chain analysis, the program targets not only those in direct phone contact with a criminal suspect but anyone with whom those individuals have been in contact as well. The DAS program, formerly known as Hemisphere, is run in coordination with the telecom giant AT&T, which captures and conducts analysis of US call records for law enforcement agencies, from local police and sheriffs' departments to US customs offices and postal inspectors across the country, according to a White House memo reviewed by WIRED. Records show that the White House has provided more than $6 million to the program, which allows the targeting of the records of any calls that use AT&T's infrastructurea maze of routers and switches that crisscross the United States. Documents released under public records laws show the DAS program has been used to produce location information on criminal suspects and their known associates, a practice deemed unconstitutional without a warrant in 2018. Orders targeting a nexus of individuals are sometimes called "community of interest" subpoenas, a phrase that among privacy advocates is synonymous with dragnet surveillance.