28 C.F.R. § 80.7
If an issuer's or domestic concern's submission does not contain all of the information required by §80.6, the Department of Justice may request whatever additional information or documents it deems necessary to review the matter. The Department must do so within 30 days of receipt of the opinion request, or, in the case of an incomplete response to a previous request for additional information, within 30 days of receipt of such response. Each issuer or domestic concern requesting an FCPA Opinion must promptly provide the information requested. A request will not be deemed complete until the Department of Justice receives such additional information. Such additional information, if furnished orally, shall be promptly confirmed in writing, signed by the same person or officer who signed the initial request and certified by this person or officer to be a true, correct and complete disclosure of the requested information. In connection with any request for an FCPA Opinion, the Department of Justice may conduct whatever independent investigation it believes appropriate.
28 C.F.R. § 80.7