David Petraeus

A key word in the Clinton email investigation: 'Knowingly'

A key word in the Clinton email investigation: 'Knowingly'

Hillary Rodham Clinton's use of a private email server while secretary of State may have been risky and politically unwise, but many experts in national security law predict it will not lead to criminal charges, based on what is known so far of her handling of classified government material.

That's because even a misdemeanor charge for mishandling classified information would require proof that Clinton knew she was keeping government secrets at "an unauthorized location."

Clinton has repeatedly said that she did not knowingly send or receive emails that were marked classified, and that her use of a personal email server — while not "the best choice"...