DUI Procedure/Evidence, Presumptions in Virginia DUI/DWI cases from alcohol content

18.2-269. Presumptions from alcohol content of blood

A. In any prosecution for a violation of § 18.2-36.1 or § 18.2-266 (ii), or any similar ordinance, the amount of alcohol in the blood of the accused at the time of the alleged offense as indicated by a chemical analysis of a sample of the accused's blood or breath to determine the alcohol content of his blood in accordance with the provisions of §§ 18.2-268.1 through 18.2-268.12 shall give rise to the following rebuttable presumptions:

(1) If there was at that time 0.05 percent or less by weight by volume of alcohol in the accused's blood or 0.05 grams or less per 210 liters of the accused's breath, it shall be presumed that the accused was not under the influence of alcohol intoxicants at the time of the alleged offense;

(2) If there was at that time in excess of 0.05 percent but less than 0.08 percent by weight by volume of alcohol in the accused's blood or 0.05 grams but less than 0.08 grams per 210 liters of the accused's breath, such facts shall not give rise to any presumption that the accused was or was not under the influence of alcohol intoxicants at the time of the alleged offense, but such facts may be considered with other competent evidence in determining the guilt or innocence of the accused; or

(3) If there was at that time 0.08 percent or more by weight by volume of alcohol in the accused's blood or 0.08 grams or more per 210 liters of the accused's breath, it shall be presumed that the accused was under the influence of alcohol intoxicants at the time of the alleged offense.