CESTAT Chennai Says ELFA Diagnostic Kits Eligible For Customs Duty Exemption Available To ELISA Kits

The Chennai Bench of the Customs, Excise, and Service Tax Appellate Tribunal (CESTAT) has held that diagnostic kits based on Enzyme-Linked Fluorescent Assay (ELFA) are entitled to the concessional customs duty exemption available to Enzyme-Linked Immunosorbent Assay (ELISA) kits.

It ruled that ELFA is not a distinct diagnostic methodology but a technologically advanced application of ELISA.

These diagnostic kits are used for medical tests, including the detection of infectious diseases, viral infections, hormonal disorders and other health conditions.

A bench of Judicial Member P. Dinesha and Technical Member Vasa Seshagiri Rao allowed the appeal filed by Biomerieux India Private Limited. It set aside a customs duty demand of more than ₹68.20 crore, along with interest, confiscation, redemption fine, and penalties.

“Merely because technological advancement has introduced fluorescence-based detection in place of conventional colorimetric detection, the essential character of the diagnostic methodology does not undergo transformation so as to exclude the goods from the ELISA category.”, it ruled.

Biomerieux India imported VIDAS diagnostic test kits and claimed the concessional customs duty exemption available to ELISA kits. The Customs Department rejected the claim, taking the view that the imported products were ELFA kits. According to the Department, ELFA was a separate technology that did not fall within the exemption notification.

It later issued a show cause notice seeking differential customs duty of more than ₹68.20 crore, along with interest, confiscation and penalties.

Before the tribunal, the company argued that ELFA kits operate on the same enzyme-linked immunoassay principle as ELISA kits. It submitted that the only difference lay in the method of signal detection. ELISA uses colour-based detection, while ELFA uses fluorescence.

The company also relied on scientific literature and clarifications issued by the National Institute of Biologicals and the Central Drugs Standard Control Organisation. Both authorities had clarified that ELFA and ELISA are "one and the same." It further argued that ELFA kits remained covered by the exemption because they were based on the ELISA principle, even though they used fluorescence instead of colour for signal detection.

The tribunal accepted those submissions. It observed that the distinction between ELFA and ELISA lies only in the mode of signal detection and not in the underlying immunological principle. It also found that the Department had not produced any scientific evidence of comparable value to rebut the expert opinions relied upon by the company.

“Law cannot be interpreted in a manner that fossilizes scientific understanding to the stage existing on the date when the Exemption Notification was originally drafted.”, it observed.

The tribunal also held that the extended period of limitation could not be invoked. It observed that the dispute concerned the interpretation of the exemption notification and that all material particulars relating to the imported goods had been disclosed to the Department.

It therefore set aside the impugned order. The tribunal also quashed the differential customs duty demand of more than ₹68.20 crore, interest, confiscation, redemption fine, and a penalty of more than ₹68.20 crore.

For Appellant: Advocates V. Lakshmi Kumaran, D. Santhana Gopalan and S. Ganesh Aravindh

For Respondent:  Anoop Singh, Authorized Representative