; and (II) withhold the identity of the source from the petitioner employer, which shall not be subject to disclosure under section 552 of title 5, United States Code. (iv) Procedure The Secretary of Labor shall establish a procedure for any person desiring to provide information described in clause (iii) that may be used, in whole or in part, as the basis for the commencement of an investigation described in such clause, to provide such information in writing on a form developed and provided by the Secretary and completed by or on behalf of the person. Such person may not be an officer or employee of the Department of Labor unless the information satisfies the requirement under clause (v)(II), although an officer or employee of the Department of Labor may complete the form on behalf of the person. (v) Information sources Any investigation initiated or approved by the Secretary of Labor under this subparagraph shall be based on information that— (I) satisfies the requirements under clause (iii); and (II) (aa) originates from a source other than an officer or employee of the Department of Labor