Whenever the Attorney General, or the Assistant Attorney General in charge of the Antitrust Division of the Department of Justice, has reason to believe that any person may be in possession, custody, or control of any documentary material, or may have any information, relevant to a civil antitrust investigation or, with respect to the International Antitrust Enforcement Assistance Act of 1994 [15 U.S.C. 6201 et seq.], an investigation authorized by section 3 of such Act [15 U.S.C. 6202], he may, prior to the institution of a civil or criminal proceeding by the United States thereon, issue in writing, and cause to be served upon such person, a civil investigative demand requiring such person to produce such documentary material for inspection and copying or reproduction, to answer in writing written interrogatories, to give oral testimony concerning documentary material or information, or to furnish any combination of such material, answers, or testimony. Whenever a civil investigative demand is an express demand for any product of discovery, the Attorney General or the Assistant Attorney General in charge of the Antitrust Division shall cause to be served, in any manner authorized by this section, a copy of such demand upon the person from whom the discovery was obtained and notify the person to whom such demand is issued of the date on which such copy was served.
A verified return by the individual serving any such demand or petition setting forth the manner of such service shall be proof of such service. In the case of service by registered or certified mail, such return shall be accompanied by the return post office receipt of delivery of such demand.
The production of documentary material in response to a demand served pursuant to this section shall be made under a sworn certificate, in such form as the demand designates, by the person, if a natural person, to whom the demand is directed or, if not a natural person, by a person or persons having knowledge of the facts and circumstances relating to such production, to the effect that all of the documentary material required by the demand and in the possession, custody, or control of the person to whom the demand is directed has been produced and made available to the custodian.
Each interrogatory in a demand served pursuant to this section shall be answered separately and fully in writing under oath, unless it is objected to, in which event the reasons for the objection shall be stated in lieu of an answer, and it shall be submitted under a sworn certificate, in such form as the demand designates, by the person, if a natural person, to whom the demand is directed or, if not a natural person, by a person or persons responsible for answering each interrogatory, to the effect that all information required by the demand and in the possession, custody, control, or knowledge of the person to whom the demand is directed has been submitted.