"The Defense Security Service (DSS) and the Defense Personnel Security Research Center (PERSEREC) conducted a pilot test of a two-phase periodic reinvestigation. In a phased reinvestigation, information collected during Phase 1 is used to determine what additional investigative steps are appropriate for Phase 2. If Phase 1 turns up issue-relevant information, Phase 2 is conducted to complete a full-scope reinvestigation. If Phase 1 turns up no issue-relevant information, the investigation is considered clean and no further investigation is done. This is similar to the approach used in medical screening, where findings of initial tests determine what follow-up tests are appropriate. A previous PERSEREC study, 'A New Approach to the SSBI-PR: Assessment of a Phased Reinvestigation', concluded that a phased reinvestigation could save substantial investigative resources with minimal loss of significant information. The saved resources, if redeployed as planned for the proposed Automated Continuing Evaluation System (ACES), will provide a substantial overall benefit to personnel security."
PERSEREC Technical Report 02-2
Defense Technical Information Center (DTIC): http://www.dtic.mil/dtic/