Code of Federal Regulations Title 32. National Defense § 32.147.19 The three standards

(a) The investigation and reinvestigation standards for “L” access authorizations and for access to confidential and secret (including all secret-level Special Access Programs not specifically approved for enhanced investigative requirements by an official authorized to establish Special Access Programs by section in 4.4 of Executive Order 12958) (60 FR 19825, 3 CFR 1995 Comp., p. 33);

(b) The investigation standard for “Q” access authorizations and for access to top secret (including top secret Special Access Programs) and Sensitive Compartmented Information;

(c) The reinvestigation standard for continued access to the levels listed in paragraph (b) of this section.