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Section 4: Presumption as to poisonous substances
Any substance specified as poisonous by rule made under Chapter II or Chapter IV 1[or Chapter IVA] shall be deemed to be a poisonous substance for the purposes of Chapter III or Chapter IV 1[or Chapter IVA], as the case may be.
Source: official text of The Drugs and Cosmetics Act, 1940 as published on India Code (PDF). All sections of the Drugs and Cosmetics Act, 1940.