No decision or order shall be issued except upon the consideration of the exclusive record in each case.
Each decision shall be supported by findings of fact based on evidence which is reliable, probative, and substantial.
Each decision or order rendered by a hearing examiner shall be in writing and shall contain findings of fact and supporting conclusions of law. The findings of fact shall consist of a concise statement of conclusions upon each contested issue of fact.
D.C. Mun. Regs. tit. 7, r. 7-308