Does the Attorney General have the authority to issue a civil investigative demand on a person in possession of documentary material or information relevant to a false claims law investigation?

"The FCA . . . is the government's primary litigative tool for combatting fraud against the federal government." United States ex rel. Kelly v. Boeing Co., 9 F.3d 743, 745 (9th Cir. 1993). "Whenever the Attorney General, or a designee . . . has reason to believe that any person may be in possession, custody, or control of any documentary material or information relevant to a false claims law investigation, the Attorney General, or a designee, may, before commencing a civil proceeding . . . , issue in writing and cause to be served upon such person, a civil investigative demand requiring such person (A) to produce such documentary material for inspection and copying, [and] (B) to answer in writing written interrogatories with respect to such documentary material or information . . . ." 31 U.S.C. 3733(a)(1)(A)-(B).