Prohibition against sale of any food or drug not of the nature, sub-stance or quality demanded

(1) If a person sells to the prejudice of the purchaser any food or drug which is not of the nature or not of the substance, or not of the quality, of the food or drug demanded by the purchaser, that person, subject to section 7, commits an offence. (2) Where regulations made under this Act contain provisions prescribing the composition of, or prohibiting or restricting the addition of any substance to, any food, a purchaser of that food shall, unless the contrary is proved, be deemed for the purposes of this section to have demanded food complying with the provisions of the regulations. (3) In proceedings under this section, it shall not be a defence to allege that the purchaser bought for analysis or examination and therefore was not prejudiced. Defenses