It's not surprising that an expert hired by EFF should produce an analysis that supports the group's case against AT&T. But last week's public court filing of a redacted statement by J. Scott Marcus is still worth reading for the obvious expertise of its author, and the cunning insights he draws from the AT&T spy documents.

An internet pioneer and former FCC advisor who held a Top Secret security clearance, Marcus applies a Sherlock Holmes level of reasoning to his dissection of the evidence in the case: 120-pages of AT&T manuals that EFF filed under seal, and whistleblower Mark Klein's observations inside the company's San Francisco switching center.

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