4 CFR 83.9 - Social Security number.
(a)
GAO may not require individuals to disclose their Social Security Number (SSN) unless disclosure would be required—
(2)
Under any statute, executive order, or regulation that authorizes any Federal, State, or local agency maintaining a system of records that was in existence and operating prior to January 1, 1975, to request the SSN as a necessary means of verifying the identity of an individual.
Title 4 published on 2013-01-01
no entries appear in the Federal Register after this date.
This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.
This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].
It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.