If as a result of the operation or the physical control of a vehicle, a person is tried in any court of competent jurisdiction within the District of Columbia for operating or being in physical control of a vehicle while under the influence of intoxicating liquor in violation of § 50-2201.05(b), negligent homicide in violation of § 50-2203.01, or manslaughter committed in the operation of a vehicle in violation of § 22-2105, and in the course of the trial there is received, based upon a chemical test, evidence of alcohol in the defendant's blood, urine, or breath, such evidence:
(1) Shall, if at the time of testing, defendant's alcohol concentration was less than 0.05 grams per 100 milliliters of blood or per 210 liters of breath or 0.06 grams or less per 100 milliliters of urine, establish a rebuttable presumption that the defendant was not, at the time, under the influence of intoxicating liquor.
(2) If at the time of testing, defendant's alcohol concentration was 0. 05 grams or more 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 constitute prima facie proof that the defendant was, at the time, under the influence of intoxicating liquor.