evidence: Classified information at the top secret level typically also entails a strict signing in and out process. An individual needing to see a Top Secret document often must sign the document out and sign it back in on return, often times to only be used in a Sensitive Compartment Information Facility (SCIF). [...] Items that can be subject to classification include everything from military plans to foreign government information to the safeguarding of nuclear materials. [...] The president and a few others have special authorities to view classified information while in or out of office. Any former president, vice president and a few others, by law, have access to all and any classified information in perpetuity by the nature of the position they held. But no one may remove classified information without proper authorization, including the president.