Hunting for Hackers, N.S.A. Secretly Expands Internet Spying at U.S. Border

"The N.S.A.’s activities run “smack into law enforcement land,” said Jonathan Mayer, a cybersecurity scholar at Stanford Law School who has researched privacy issues and who reviewed several of the documents. “That’s a major policy decision about how to structure cybersecurity in the U.S. and not a conversation that has been had in public.”"