201 through 203, is further amended by adding at the end the following: (J) (i) The Secretary of Homeland Security may initiate an investigation of any employer that employs nonimmigrants described in section 101(a)(15)(L) with regard to the employer’s compliance with the requirements under this subsection. (ii) If the Secretary receives specific credible information from a source who is likely to have knowledge of an employer’s practices, employment conditions, or compliance with the requirements under this subsection, the Secretary may conduct an investigation into the employer’s compliance with the requirements of this subsection. The Secretary may withhold the identity of the source from the employer, and the source’s identity shall not be subject to disclosure under section 552 of title 5, United States Code. (iii) The Secretary shall establish a procedure for any person desiring to provide to the Secretary information described in clause (ii) that may be used, in whole or in part, as the basis for the commencement of an investigation described in such clause, to provide the information in writing on a form developed and provided by the Secretary and completed by or on behalf of the person. (iv) No investigation described in clause (ii) (or hearing described in clause (vi) based on such investigation) may be conducted with respect to information about a failure to comply with the requirements under this subsection, unless the Secretary receives the information not later than 24 months after the date of the alleged failure. (v) Before commencing an investigation of an employer under clause (i) or (ii), the Secretary shall provide notice to the employer of the intent to conduct such investigation. The notice shall be provided in such a manner, and shall contain sufficient detail, to permit the employer to respond to the allegations before an investigation is commenced. The Secretary is not required to comply with this clause if the Secretary determines that to do so would interfere with an effort by the