Oregon Revised Statutes Alcoholic Liquors; Controlled Substances; Drugs § 471.680

In any prosecution for the sale of alcoholic liquor it is not necessary to prove the exact variety, or to mention the quantity of alcoholic liquor sold, except in the case where the variety or quantity is essential to establish the offense. As regards quantity it is sufficient to allege the sale of a quantity, the sale of which quantity is unlawful. The description of any offense, alleged to be a violation of the Liquor Control Act, in the words of that statute or in any words of like effect, is sufficient in law. Any exceptions, exemptions, provisions, excuse or qualification may be proved by the defendant, but need not be specified or negatived in the complaint, information or indictment. If it is so specified or negatived, no proof in relation to the matter so specified or negatived is required on the part of the plaintiff, informant or complainant.