27. (1) The production in any inquiry, trial or other proceedings under this Act of a certificate under the hand of a Public Analyst in the form prescribed shall, until the contrary is proved, be sufficient to prove the facts therein stated. (2) When any person is accused of an offence under this Act, he may request the Court to summon as a witness the Public Analyst who analysed the sample in respect of which he is accused of having committed an offence and the Court may, and, in every case in which the accused deposits in the Court a sum of money in accordance with the scale prescribed, shall, summon the Public Analyst, and if such person is acquitted, any sum of money so deposited shall be refunded to him.