D.C. Mun. Regs. tit. 18, r. 18-1399
When used in this chapter, the following terms shall have the meanings ascribed, notwithstanding any definition in Section 9901:
Authorized Law Enforcement Official - any member of the District of Columbia Metropolitan Police Department, the U.S. Park Police, or the U.S. Capitol Police, who is duly authorized to enforce traffic laws within the boundaries of the District of Columbia.
Chemical Test - a test of a person's blood, urine, or breath for the purpose of determining the alcohol concentration or blood-drug-content in accordance with D.C. Official Code §§ 50-1902 and 50-1903, except the alcohol concentration shall be 0.04 grams per 100 milliliters of blood, per 210 liters of breath, or per 67 milliliters of urine instead of 0.10 grams per 100 milliliters of blood, per 210 liters of breath, or per 67 milliliters of urine.
Commerce - (a) any trade, traffic or transportation within the jurisdiction of the United States between a place in a state and a place outside of the state, including a place outside of the United States; and (b) any trade, traffic, and transportation in the United States which affects any trade, traffic and transportation described in part (a) of this definition.
Commercial Learner Permit - a driver's license issued by the District of Columbia or another jurisdiction, in accordance with the federal regulations, 49 CFR Part 383, to an individual which authorizes the individual to operate a class of commercial vehicles, if the individual:
Commercial Driver License - a driver's license issued by the District of Columbia or other jurisdiction, in accordance with the federal regulations, 49 CFR Part 383, to an individual which authorizes the individual to operate a class of commercial vehicle.
Conviction - means an unvacated adjudication of guilt, or a determination that a person has violated or failed to comply with the law in a court of original jurisdiction or by an authorized administrative tribunal, an unvacated forfeiture of bail or collateral deposited to secure the person's appearance in court, a plea of guilty or nolo contendere accepted by the court, the payment of a fine or court cost, or violation of a condition of release without bail, regardless of whether or not the penalty is rebated, suspended, or probated.
Department - the Department of Motor Vehicles
Mobile telephone -- a mobile communication device that falls under or uses any commercial mobile radio service, as defined in regulations of the Federal Communications Commission, 47 C.F.R. part 20.3. It does not include two-way or Citizens Band Radio services.
School bus - a bus which is regularly used by or on behalf of a school to transport children to or in connection with school activities; Provided, that this definition shall not include buses operated by common carriers which are not used primarily for the transportation of school children, or vehicles owned by the United States government.
Texting -- means manually entering alphanumeric text into, or reading text from, an electronic device that includes, but is not limited to, short message service, e-mailing, instant messaging, a command or request to access an internet page, or engaging in any other form of electronic text retrieval or entry, for present or future communication.
Any other term not defined above shall have the same meaning as that prescribed in 49 CFR 383 and 391.
D.C. Mun. Regs. tit. 18, r. 18-1399