When is a security clearance terminated?

Information on termination of clearances.

A clearance is terminated when a person permanently leaves a position for which the clearance was granted. Cleared individuals who no longer require access to classified information, but who remain continuously employed by the same cleared contractor (or government agency) and do not anticipate future access can have their clearances administratively downgraded or withdrawn until such time that they require access again, provided their security clearance investigation has not gone out-of-date. Under such circumstances the clearance can be administratively restored.