29 C.F.R. § 810.515
The Administrator shall conduct verifications as may be appropriate and, in connection therewith, enter and inspect any places, inspect any records and make transcriptions or copies thereof, question any persons, and gather any other information as deemed necessary by the Administrator to determine compliance regarding the matters which are the subject of the verification. Upon request by the Administrator, an employer or other entity whose plant or facility is subject to verification shall make available to the Administrator all records, information, persons, and places that the Administrator deems necessary to copy, transcribe, question, or inspect to determine compliance regarding the matters which are the subject of the verification. In conducting any verifications, the Administrator will coordinate with CBP and other federal agencies (including requesting information from such agencies) as appropriate.
29 C.F.R. § 810.515