The F.B.I. investigation that toppled the director of the C.I.A. and has now entangled the top American commander in Afghanistan underscores a danger that civil libertarians have long warned about: that in policing the Web for crime, espionage and sabotage, government investigators will unavoidably invade the private lives of Americans.
On the Internet, and especially in e-mails, text messages, social network postings and online photos, the work lives and personal lives of Americans are inextricably mixed. Private, personal messages are stored for years on computer servers, available to be discovered by investigators who may be looking into completely unrelated matters.
…“It’s a particular problem with cyberinvestigations — they rapidly become open-ended because there’s such a huge quantity of information available and it’s so easily searchable,” he said, adding, “If the C.I.A. director can get caught, it’s pretty much open season on everyone else.”