In his prepared statement concluding the FBI criminal investigation, FBI Director James B. Comey states that "All the cases prosecuted involved some combination of: clearly intentional and willful mishandling of classified information; or vast quantities of materials exposed in such a way as to support an inference of intentional misconduct; or indications of disloyalty to the United States; or efforts to obstruct justice." Director Comey explains exactly how Secretary of State Clinton engaged in "clearly intentional and willful mishandling of classified information" by using multiple unsecured devices: "Secretary Clinton used several different servers and administrators of those servers during her four years at the State Department, and used numerous mobile devices to view and send e-mail on that personal domain."
He also states the "vast quantities of material exposed" (over 2000 classified emails), and the efforts to obstruct justice by wiping out emails.
Director Comey sums up that "we cannot find a case that would support bringing criminal charges on these facts."
2+2=5 Director Comey loves Big Sister.