James R. Clapper

In the end, we will never, ever be able to guarantee that there will not be an Edward Snowden or another Chelsea Manning because this is a large enterprise composed of human beings with all their idiosyncrasies.

In 1979, the Supreme Court ruled 5-3 in Smith v. Maryland that a few days' worth of phone records for a single individual were not protected by the Fourth Amendment. The NSA today, though, collects hundreds of millions of phone records from hundreds of millions of Americans without an individualized warrant.