This NSA memo from 23 March 2012 presentation describes the agency’s proposal for a fourth FAA 702 certification that would allow it to target hackers “tied to malicious cyber activity”: see the New York Times article Hunting for Hackers, N.S.A. Secretly Expands Internet Spying at U.S. Border, 4 June 2015.
USA Today has revealed that a huge DEA phone records programme – which tracked and stored data relating to international phone calls placed by US persons – was halted as a result of Edward Snowden’s revelations. The DEA database predated 9/11 by almost ten years and “provided a blueprint for the far broader National Security Agency surveillance that followed.”
Extracts from an NSA document dated 3 October 2012 show that the agency proposed using records of online activity to discredit six individuals. Also included is the document’s distribution list and the targeting rationale for the six individuals involved (all identifying information has been redacted): see the Huffington Post article Top-Secret Document Reveals NSA Spied On Porn Habits As Part Of Plan To Discredit ‘Radicalizers’, 26 November 2013.
A Targeting Rationale document details how NSA analysts should justify their targeting decisions: see the Washington Post article NSA broke privacy rules thousands of times per year, audit finds, 15 August 2013.
This 2007 US Department of Justice memo argues that analysis of US metadata is “consistent with” the Fourth Amendment, FISA and the electronic surveillance provisions of the United States Code [the Code of Laws of the United States of America] because the data is already in the NSA’s databases: see the Guardian article NSA collected US email records in bulk for more than two years under Obama, 27 June 2013.