D.C. Mun. Regs. tit. 18, r. 18-1034
The standards of competent proof, based upon a chemical test, set forth in this section shall be used to determine the condition of an operator of a motor vehicle with respect to the effect of alcohol concentration of the operator at the time of the operation of a motor vehicle within the District of Columbia. These presumptions shall be rebuttable.
If at the time of testing, the operator's alcohol concentration was 0.05 grams or less per 100 milliliters of blood or per 210 liters of breath or 0.06 grams or less per 100 milliliters of urine, this evidence shall establish a presumption that the operator was not, at the time, under the influence of intoxicating liquor.
If at the time of testing, the operator's alcohol concentration was more than 0.05 grams per 100 milliliters of blood or per 210 liters of breath or more than 0.06 grams per 100 milliliters of urine, but less than 0.08 grams per 100 milliliters of blood or per 210 liters of breath or less than 0.10 grams per 100 milliliters of urine, this evidence shall not establish a presumption that the operator was or was not, at the time, under the influence of intoxicating liquor, but it may be considered with other competent evidence in determining whether the operator was under the influence of intoxicating liquor.
[REPEALED] D.C. Law 4-145, 29 DCR 3138, 3149 (July 23, 1982)
D.C. Mun. Regs. tit. 18, r. 18-1034