The rules are strict and complex! The myth of a government job is forever is bogus. It is most often ended by a charge of mishandling classified material. It is like Capone getting arrested for taxes and not for the actual crimes. After that even porn on a phone can get you fired. When a government worker is working with classified material, the computer often auto-saves the classified info without the user's knowledge but the rules are to go back and remove the save. Almost everyone is guilty of mishandling when every trace is not unknowingly removed. BUT IN BIDEN'S CASE it was his staff's job to be sure document handling is cleaned up. There is a big difference between top secret and classified or confidential.

Senators and Congressmen have to use an eye's only SKIF to view documents but not in the old days.