(a) The provisions of this article shall not apply to the sale or transfer of products which include a listed precursor chemical if the product may be sold lawfully with a prescription or over the counter without a prescription under the Federal Food, Drug, and Cosmetic Act (21 U.S.C. Section 301 et seq.), or under a rule adopted pursuant to that act.
(b) Notwithstanding any other provision of this article, no person shall be required to obtain a listed precursor license or permit for the sale, receipt, transfer, manufacture, or possession of a listed precursor chemical when:
(1) Such person is a duly licensed physician, dentist, veterinarian, podiatrist, or pharmacist, when the sale, receipt, transfer, manufacture, or possession of such listed precursor chemical is a transaction otherwise lawfully authorized;
(2) A domestic lawful distribution in the usual course of business between agents or employees of a single regulated person;
(3) A delivery of a listed precursor chemical to or by a common or contract carrier for carriage in the lawful and usual course of the business of the common or contract carrier or to or by a warehouseman for storage in the lawful and usual course of the business of the warehouseman.