The individual is an employee of a Department of Energy (DOE) contractor who has held a security clearance for several years. During a routine reinvestigation, the local security office (LSO) discovered that the individual had not filed federal taxes for the tax years 2008 and 2009. In July 2011, the LSO interviewed the individual during a Personnel Security Interview (PSI), but that interview did not resolve the security concerns. The LSO suspended his clearance and, in August 2011, the LSO informed the individual that it had received derogatory information that created a doubt regarding his continued eligibility for access authorization. See Notification Letter (August 2011). The Notification Letter stated that the derogatory information regarding the individual falls within the purview of 10 C.F.R. § 710.8 (l) (Criterion L).