1. Any carrier transporting pesticides if such carrier permits the Commissioner to copy all records showing the transactions in and movements of the pesticides upon request;

2. Public officials of the Commonwealth and the federal government engaged in the performance of their official duties;

3. Individuals or agencies authorized by law to conduct research in the field of pesticides when such research is conducted in accordance with regulations established by the Board; and

4. Any person who establishes a guaranty signed by, and containing the name and address of, the registrant or person residing in the United States from whom he purchased and received in good faith the pesticide in the same unbroken package, to the effect that the pesticide was lawfully registered at the time of sale and delivery to him, and that it complies with the other requirements of this chapter, designating this chapter. In such case the guarantor shall be subject to the penalties that would otherwise attach to the person holding the guaranty under the provisions of this chapter.