Oregon Revised Statutes Agriculture § 561.750

(1) “Anhydrous ammonia”:

(2) “Distributor” means a person that imports, consigns, sells, offers for sale, barters, exchanges or otherwise facilitates the supply of anhydrous ammonia to a user in this state.

(3) “Nontoxic dye” means a biodegradable, clear liquid product that causes staining when exposed to air.

(4) “Other additive” means a product other than a nontoxic dye that, when put in tanks containing anhydrous ammonia, renders the anhydrous ammonia nonreactive, unusable or undesirable for use as a precursor substance in the manufacture of methamphetamine.

(5) “User” means a person that applies anhydrous ammonia as a plant nutrient in the course of engaging in agricultural activity in this state.