Every pesticide which is used, distributed, sold, or offered for sale within this state or delivered for transportation or transported in intrastate commerce or between points within this state through any point outside this state shall be registered every two years with the office of the commissioner; provided that any pesticide imported into this state, which is registered under the provisions of any federal act providing for the registration of pesticides may, in the discretion of the commissioner, be exempted from registration under this article, when sold or distributed in the unbroken immediate container in which it was originally shipped.