Headline: Snowden: US Lacks Proof That Mass Surveillance Is EffectiveLink: http://sputniknews.com/military/20141213/1015796816.htmlPublication Date: Monday, December 15, 2014Primary Source: Sputnick NewsType: new media postFormat: New MediaNature of Mention: mentionedScholar: CatoResearch Area: Foreign Policy and National SecuritySubjects: Edward Snowden's comments at the Cato Institute's Surveillance Conference