According to court records from 2009, after repeated assurances the NSA would obey the court's rules, it acknowledged that it had collected material improperly.
In one instance, the government said its violations were caused by "poor management, lack of involvement by compliance officials and lack of internal verification procedures, not by bad faith." In another case, the NSA said it improperly collected information due to a typographical error.
The Obama administration published the heavily censored files last night as part of an ongoing civil liberties lawsuit challenging the constitutionality of the government's collection of phone records, which the White House has said is important to countering terrorism.
The files published yesterday night were so heavily censored that one of the two justifications for the government to search through Americans' phone records was blacked out.
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Meanwhile, in a legal victory for the administration, the Supreme Court yesterday refused to intervene in the NSA controversy.
It rejected a call from a privacy group to stop the agency from collecting the telephone records of millions of Verizon customers in the United States.
While the justices yesterday declined to get involved in this issue, other lawsuits on the topic are making their way through the lower courts around the US.
In the new disclosures, some files were declassified ostensibly to show that even when NSA employees collected records improperly or improperly shared material among themselves, those problems were reported to the intelligence court and new procedures were put in place to prevent them from happening again.