Full text
if a sample of the accused’s blood has been taken under section 254 or 256 or with the accused’s consent, evidence of the result of the analysis of that sample is conclusive proof, in the absence of evidence tending to show that the analysis was performed improperly, that the concentration of alcohol in the accused’s blood both at the time when the sample was taken and at the time when the offence was alleged to have been committed was the concentration determined by the analysis or, if more than one sample was analyzed and the results of the analyses are the same, the concentration determined by the analyses and, if the results of the analyses are different, the lowest of the concentrations determined by the analyses, provided that