In the study, the New America Foundation reviewed 225 terrorism cases and found that traditional investigation and law enforcement methods actually did the most to prevent attacks. About a third of the leads in terrorism cases came from tips or an informant, while old school surveillance warrants were used in 48 cases. All things told, bulk telephony metadata collection provided evidence in only one case, a case that didn’t even present the threat of an attack against the United States.
via NSA Phone Spying Is Useless In Preventing Terrorist Attacks, Study Says.
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