"Sec. 1401. Conditions for Examination. — For the protection of government revenue and public interest and to prevent the entry into the country of smuggled or contraband goods, the Commissioner shall, in consultation with the Oversight Committee and subject to the approval of the Secretary of Finance, promulgate the rules and regulations that shall prescribe the procedure in accordance with which examination shall be undertaken on the importation and the required quantity or percentage thereof: Provided, That the imported articles shall in any case be subject to the regular physical examination when: 

"(1) The government surveyor's seal on the container has been tampered with or broken or the container shows signs of having been opened or having its identity changed;
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"(2) The container is leaking or damaged;

"(3) The number, weight and nature of packages indicated in the customs entry declaration and supporting documents differ from that in the manifest; chan robles virtual law library

"(4) The shipment is covered by alert/hold orders issued pursuant to existing orders; 

"(5) The importer disagrees with the findings as contained in the government surveyor's report; or 

"(6) The articles are imported through air freight where the Commissioner or Collector has knowledge that there is a variance between the declared and true quantity, measurement, weight, and tariff classification." 

"Sec. 1403. Duties of Customs Officer Tasked to Examine, Classify, and Appraise Imported Articles. — The customs officer tasked to examine, classify, and appraise imported articles shall determine whether the packages designated for examination and their contents are in accordance with the declaration in the entry, invoice and other pertinent documents and shall make return in such a manner as to indicate whether the articles have been truly and correctly declared in the entry as regard their quantity, measurement, weight, and tariff classification and not imported contrary to law. He shall submit samples to the laboratory for analysis when feasible to do so and when such analysis is necessary for the proper classification, appraisal, and/or admission into the Philippines of imported articles.chan robles virtual law library

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"Likewise, the customs officer shall determine the unit of quantity in which they are usually bought and sold and appraise the imported articles in accordance with Section 201 of this Code.chanrobles virtual law library 

"Failure on the part of the customs officer to comply with his duties shall subject him to the penalties prescribed under Section 3604 of this Code."