(a) The hearing officer shall make a final determination within 10 days of the conclusion of the hearing.

(b) The hearing officer shall make his or her determination or order in writing after consideration of the entire record and as supported by substantial evidence. Substantial evidence means such proof as a reasonable person may accept as adequate to support a decision and constitutes a rational basis for the decision.

(c) The determination shall contain findings of fact and conclusions of law or reasons for the decision.

(d) The Attorney General shall serve a copy of such determination or order upon the respondent personally or by registered or certified mail to the last known business address, or to the attorney of record.

(e) The Attorney General shall maintain an index of all final written decisions by name and subject area.