Whenever the Federal Trade Commission (FTC) has reason to believe that any person has violated 15 USC section 13, 14, 18 or 19, it must issue and serve on that person and on the Attorney General of the United States, a complaint stating its charges in that regard. The notice shall also give a date for a hearing in the matter. Delivery of the subpoena duces tecum for production of documents may be done in person, or by certified letter. Receipt of the letter is considered proof of service.