Source: Boston Globe
For the first time, NSA Deputy Director John C. Inglis disclosed that the agency sometimes conducts what is known as <b>three-hop analysis</b>. That means the government can look at the phone data of a suspected terrorist, plus the data of all of the contacts, then all of those people’s contacts, and all of those people’s contacts.
If the average person calls 40 unique people, three-hop analysis could allow the government to mine the records of 2.5 million Americans when investigating one suspected terrorist.
The government says it stores everybody’s phone records for five years.