The various issues and assumptions that can render an opinion, include:
i) The test results were accurate; being that the process is subjective to the person conducting the measurements, certain errors in the measurement, for example, of weight, might not be correct. The test results, therefore, must be assumed to be correct so as to render an opinion.
ii) There are various consumable products, other than beer, which contain different percentage of alcohol in them. The type of drink, which the accused used, should be assumed to be beer. It is necessary to believe that the person only took beer since the court may not be too sure that the person only took beer, and that the be...