Federal law enforcement agencies do not limit their surveillance of US residents to phone calls, emails and geo-location information. They are also interested in calling cards, credit cards, rental cars and airline reservations, as well as retail shopping clubs.
The document also reveals that DOJ’s preferred method of obtaining this information is via an administrative subpoena. The only role that courts play in this process is in issuing non-disclosure orders to the banks, preventing them from telling their customers that the government has spied on their financial transactions. No Fourth Amendment analysis is conducted by judges when issuing such non-disclosure orders.