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12. The stand of learned counsel for the assessee is that the absence of specific reference to mens rea is a case of casus omissus. If the contention of learned counsel for the assessee is accepted that the use of the expression "assessee shall be liable" proves the existence of discretion, it would lead to a very absurd result. In fact in the same provision there is an expression used i.e. "liability to pay duty". It can by no stretch of imagination be said that the adjudicating authority has even a discretion to levy duty less than what is legally and statutorily leviable. Most of cases relied upon by learned counsel for the assessee had their foundation on Bharat Heavy Electrical's case (supra). As noted above, the same is based on concession and in any event did not indicate the correct position in law.

17. While interpreting a provision the court only interprets the law and cannot legislate it. If a provision of law is misused and subjected to the abuse of process of law, it is for the legislature to amend, modify or repeal it, if deemed necessary.

(See CST v. Popular Trading Co. (2000) 5 SCC 511) The legislative casus omissus cannot be supplied by judicial interpretative process.

18. Two principles of construction - one relating to casus omissus and the other in regard to reading the statute as a whole, appear to be well settled. Under the first principle a casus omissus cannot be supplied by the court except in the case of clear necessity and when reason for it is found in the four corners of the statute itself but at the same time a casus omissus should not be readily inferred and for that purpose all the parts of a statute or section must be construed together and every clause of a section should be construed with reference to the context and other clauses thereof so that the construction to be put on a particular provision makes a consistent enactment of the whole statute. This would be more so if literal construction of a particular clause leads to manifestly absurd or anomalous results which could not have been intended by the legislature. "An intention to produce an unreasonable result", said Danckwerts, L.J. in Artemiou v.

19. It is then true that:

"When the words of a law extend not to an inconvenience rarely happening, but due to those which often happen, it is good reason not to strain the words further than they reach, by saying it is casus omissus, and that the law intended quae frequentius accidunt."

"But", on the other hand, "it is no reason, when the words of a law do enough extend to an inconvenience seldom happening, that they should not extend to it as well as if it happened more frequently, because it happens but seldom". (See Fenton v. Hampton (1858) 11 MOO PC 347).

20. A casus omissus ought not to be created by interpretation, save in some case of strong necessity. Where, however, a casus omissus does really occur, either through the inadvertence of the legislature, or on the principle quod enim semel aut bis existit praetereunt legislatores, the rule is that the particular case, thus left unprovided for, must be disposed of according to the law as it existed before such statute - casus omissus et oblivioni datus dispositioni communis juris relinquitur; "a casus omissus", observed Buller, J. in Jones v. Smart 1785 (1) TR 44:99 ER 963 (ER p.