(a) It is a defense to prosecution under this subchapter that the defendant:
(1) is a carrier who was lawfully engaged in transporting a pesticide or device within this state and who, on request, permitted the department to copy all records showing the transactions in and movement of the pesticide or device;
(2) is a public official of this state or the federal government who was engaged in the performance of an official duty in administering state or federal pesticide law or engaged in pesticide research;
(3) is the manufacturer or shipper of a pesticide that was for experimental use only by or under the supervision of an agency of this state or of the federal government authorized by law to conduct research in the field of pesticides and the manufacturer or shipper held a valid experimental use permit as provided by this chapter; and
(4) manufactured or formulated a pesticide or device solely for export to a foreign country and prepared or packed the pesticide or device according to the specifications or directions of the purchaser.
(b) It is a defense to prosecution under § 76.201(a)(3) of this code that the defendant is an applicator who, after acquiring an unbroken container, opened and transported the open container to and from application and storage sites as necessary.

(c) It is an affirmative defense to prosecution under § 76.201(e) of this code that the defendant was using, causing to be used, handling, storing, or disposing of the pesticide in accordance with a label that complied with this chapter and rules adopted under this chapter.