45 C.F.R. § 235.110
State plan requirements: A State plan under title I, IV-A, X, XIV, or XVI of the Social Security Act must provide:
(a) That the State agency will establish and maintain:
(2) Procedures developed in cooperation with the State's legal authorities for referring to law enforcement officials situations in which there is valid reason to suspect that fraud has been practiced.
The definition of fraud for purposes of this section will be determined in accordance with State law.
[36 FR 3869, Feb. 27, 1971]