Section 29

When any tobacco product, smoking substance or substitute tobacco product suspected of being in violation of the provision of this Act has been obtained according to section 27 or has been seized according to section 32, 33 or 35, from the place where the authorized officer reasonably believes is used or may be used for the purpose of manufacturing, packaging, storage, delivery, distribution or sale of the tobacco product, smoking substance or substitute tobacco product and the tobacco product, smoking substance or substitute tobacco product is contained in a number of receptacles, it shall be sufficient to analyse samples of the contents of a number not less than ten per centum of such receptacles and if such analysis establishes that such samples are all of the same nature and description, it shall be presumed, until the contrary is proved, that the contents of all the receptacles were of the same nature and description as the samples so analyzed and if such analysis establishes that such samples consist of or contain tobacco product, smoking substance or substitute tobacco product, it shall be presumed, until the contrary is proved, that the contents of all the receptacles consist of or contain the same proportion of such tobacco product, smoking substance and substitute tobacco product.