(b) Upon calling a hearing, the director shall serve notice personally or by mail to the licensee or registrant specifying the time and place of the hearing at least 10 days prior to the hearing. At the hearing, the director may do all of the following:

1. (1) Administer oaths and hear testimony.
2. (2) Issue subpoenas requiring the attendance of the licensee, registrant, or witnesses, together with books, records, memoranda, papers, and all other documents that may be pertinent to the case.
3. (3) Compel the disclosure of the licensee or registrant and any witness of all the facts known to him or her regarding the case. In no instance shall any employee of the Feed, Fertilizer, and Livestock Drugs Branch serve as the hearing officer in any case under this section.