(NEWSER– The NSA's controversial trove of phone metadata "has had no discernible impact on preventing acts of terrorism," a new analysis of 225 terrorism cases from the nonprofit New America Foundation has concluded. Most of the cases it looked at were cracked using old-fashioned investigative tools, like tip-offs from family or community members, or the use of informants, theWashington Post reports. Bulk surveillance had "only the most marginal of impacts," helping to initiate at most 1.8% of cases.

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