Look up the full text of one NIST 800-53 security control or NIST 800-171 CUI security requirement by id — the control statement (requirement prose), discussion/guidance, and related controls. Use for "what does NIST control AC-2 require", "NIST 800-53 AC-2 access control", "FedRAMP control SC-7 boundary protection", "NIST authenticator management IA-5", "NIST CUI control 800-171 3.1.1". Forgiving id: accepts "AC-2", "ac-2", "AC-02", control enhancements "AC-2(1)" or "AC-2.1", and CUI ids "3.1.1" / "3.01.01". Source: SP 800-53 Rev 5 and SP 800-171 Rev 3 (official NIST OSCAL, public domain). Examples: {"id":"AC-2"}, {"id":"SC-7"}, {"id":"IA-5"}, {"id":"AC-2(1)"}, {"id":"3.1.1"}.