Interoffice Memorandum: Processing of Form I-90s Filed by Aliens Who Pose National Security or Egregious Public Safety Concerns [open pdf - 29KB]
"This memorandum reaffirms the guidance provided in the July 11, 2006, memorandum entitled Disposition of Cases Involving Removable Aliens (PM110) as it relates to the processing of an Application to Replace Permanent Resident Card (Form I-90), filed by an alien who poses a national security or egregious public safety concerns. It also modifies the February 16, 2007,memorandum entitled National Security Reporting Requirements, and provides new guidance regarding the adjudication of a Form I-90 filed by an alien who poses a national security concern."
U.S. Citizenship and Immigration Services: http://www.uscis.gov/