D.C. Mun. Regs. tit. 8, r. 8-B443
Each claim for hotel accommodations shall be supported by hotel receipts indicating the traveler's name, the date(s), and the amount charged per day.
Each claim for meal reimbursement shall be supported by receipts indicating the date, the number of persons, and the amount (including tax and tip) for meals costing more than ten dollars ($ 10). In no event shall the tip exceed fifteen percent (15%) of the total bill. The cost of alcoholic beverages indicated on the receipts shall not be reimbursed.
Each claim for reimbursement of registration fees shall be supported by receipts. Each receipt shall include the name of the registrant; the date(s) of the conference, seminar, or other registration; and the total amount paid.
Charges for local and long distance telephone calls, telegrams, or cablegrams related to official business shall be reimbursed. A log or statement shall be submitted indicating (for each call) the person called, the purpose of the call, the date, and the amount.
The cost of express mail or delivery services related to official business shall be reimbursed. A statement, accompanied by receipts, shall be submitted for each shipment indicating to whom the shipment was sent, the purpose of the shipment, the date, and the amount.
The cost of personal telephone calls, telegrams, cablegrams, mail, or deliveries shall not be reimbursed.
Other miscellaneous expenses not enumerated in this section, when necessarily incurred in connection with the transaction of official business, shall be allowed when authorized or approved.
D.C. Mun. Regs. tit. 8, r. 8-B443