Idaho Code § 22-614: Adulteration.

No person shall distribute an adulterated fertilizer product. A fertilizer is adulterated if:

(1) It contains any deleterious or harmful substance in sufficient amount to render it injurious to beneficial plant life, animals, humans, aquatic life, soil, or water when applied in accordance with directions for use on the label; or, if adequate warning statements or directions for use which may be necessary to protect plant life, animals, humans, aquatic life, soil, or water are not shown upon the label;

(2) Its composition falls below or differs from that which it is purported to possess by its labeling; or

(3) It contains unwanted crop seed or weed seed.