31. (1) Every public analyst to whom a sample has been submitted under section 30 for analysis or bacteriological or other examination shall- (a) analyse or examine such sample or cause such sample to be analysed or examined;(b) not later than ¹[seven days in normal case and two days in case of emergency] after the date on which he receives the sample, deliver to the person submitting it a certificate in the form provided in the Schedule, specifying the result of the analysis or examination, as the case may be; (c) send a copy of the certificate to the local authority concerned. (2) For the purpose of computing the period of ²[seven days in normal case and two days in case of emergency] referred to insub-section (1), any day which is a public holiday within the meaning of section 25 of the Negotiable Instruments Act, 1881, shall be excluded. (3) Any document purporting to be a certificate in the form provided in the Schedule and signed by a public analyst shall, in any inquiry, trial or proceeding under this Ordinance, be deemed to be sufficient evidence of the result of an analysis or examination made under this section.