Although we did not find clear evidence that Secretary Clinton or her colleagues intended to violate laws governing the handling of classified information, there is evidence that they were extremely careless in their handling of very sensitive, highly classified information.

We don't want to put people in jail unless we prove that they knew they were doing something they shouldn't do.

Even if information is not marked classified in an email, participants who know or should know that the subject matter is classified are still obligated to protect it.

James Comey Quotes