80. (1) On the delivery ¹[or electronic transmission] of such bill, the goods or such part thereof as may be necessary may, without undue delay, be examined or tested ²[in the presence of the owner or his agent, unless due to any exceptional circumstance such presence cannot be allowed] and thereafter the goods shall be assessed to duty, if any, and the owner of such goods may then proceed to clear the same for home-consumption or warehouse them, subject to the provisions hereinafter contained. (2) Notwithstanding anything contained in sub-section (1), imported goods prior to examination or testing thereof may be permitted by the appropriate officer to be assessed to duty on the basis of the statements made in the bill relating thereto and the information furnished under the rules and the documents produced under section 26; but if it is found subsequently on examination or testing of the goods or otherwise that any statement in such bill or document or any information so furnished is not correct in respect of any matter relating to the assessment, the goods shall, without prejudice to any other action which may be taken under this Act, be re-assessed to duty. ³[(3) Subject to the guidelines, if any, given by the Board from time to time, the Commissioner of Customs or any other Customs officer authorised by him in this behalf may clear any goods or class of goods imported by an importer or a class of importers without examination and testing of the goods, wholly or partly under sub-section (1). (4) Upon delivery or transmission of the bill of entry for the goods cleared or to be cleared under sub-section (3) the duty shall be deemed to have been duly assessed for the purposes of this section: Provided that where the appropriate officer has reason to believe that in case of any bill of entry re-assessment is necessary, he may, by recording reasons in writing re-assess the duty payable for the goods and take such other actions as he may deem fit under this Act.]