“4. (1) For the purposes of these Regulations food is adulterated—
(a) if it consists wholly or in part of, or is mixed with, any filthy, decomposed or putrid animal or vegetable substance;
(b) if it consists wholly or in part of, or is mixed with, any portion of an animal or vegetable unfit for use as or in a food, whether manufactured or not;
(c) if it has not been sufficiently cleaned or purified;
(d) if it is the product of a diseased animal, or of one that has died otherwise than by slaughter; or
(e) if it is damaged, deteriorated or perished.
“(2) For the purposes of these Regulations a drug is adulterated—
(a) if another substance has been substituted, wholly or in part, for the drug; or
(b) if it is damaged, deteriorated or perished.”.