During the course of any hearing, the administrative law judge, in addition to the other powers specifically conferred upon him or her, and subject to the limitations imposed upon him or her by this Part, shall have full authority to control the conduct and procedure of the hearing and the record thereof, to admit or exclude testimony or other evidence, and to rule upon all motions and objections. It shall be the duty of the administrative law judge to see that a full inquiry is made into all the facts in issue and to obtain a complete record of all facts necessary for a fair determination of the issues. The administrative law judge shall have the right to call and examine witnesses, to direct the production of papers or other matter present in the hearing room, and to introduce documentary or other evidence, except as may otherwise be limited herein.