49 CFR § 661.21 - State Buy America provisions.
(a) Except as provided in paragraph (b) of this section, any State may impose more stringent Buy America or buy national requirements than contained in section 165 of the Act and the regulations in this part.
(b)FTA will not participate in contracts governed by the following:
(1) State Buy America or Buy National preference provisions which are not as strict as the Federal requirements.
(2) State and local Buy National or Buy America preference provisions which are not explicitly set out under State law. For example, administrative interpretations of non-specific State legislation will not control.
(3) State and local Buy Local preference provisions.