Judgement DHARMADHIKARI, J.:- This Writ Petition is filed through Jail by the detenu challenging the order of detention issued on 25th October, 1985, detaining him under the provisions of the National Security Act. Though various contentions were raised in the petition and argued before us, it is not necessary to make a detailed reference to them since in our view, the detenu is entitled to be released on a short ground viz. that the material which was not disclosed to him and copies of which were also not supplied, was also relied upon for passing the order, of detention. We are also informed that the co-detenus who were detained on the basis of similar incidents are already released by this Court in Writ Petition No. 913 of 1985 decided on 30-1-1986 and Writ Petition No. 915 of 1985, decided on 28-2-1986. 2. In para 9 of the affidavit filed by the detaining authority, this is what has been stated by the Dy. Inspector General of Police :- "I deny that the chapter case No. 74/85 under S.110 of the Criminal Procedure Code is totally false as alleged in the petition I say that the said chapter case has been filed against the detenu under S.110 of the Criminal Procedure Code as a preventive action as the detenu was found to be indulging in violent activities. Such routine preventive measures have failed to reform the criminal behaviour of the detenu and hence his detention under the said Act." From the bare reading of this averment, it is quite clear that apart from the incidents referred to in ground No. 2, according to the detaining authority, some more preventive measures were taken which have failed to reform the criminal behaviour of the detenu and, therefore, the order of detention came to be passed under the National Security Act. Admittedly, only a reference is made in the grounds of detention to one such preventive measure. Using of the expression in plural is indicative of the fact that the detaining authority took into consideration more than one such case. This either show non-application of mind or that some more incidents were taken into consideration while issuing the order of detention which are not disclosed in the grounds of detention and, therefore, obviously copies of which were not supplied to the detenu. This will obviously affect his right to make an effective representation. This either show non-application of mind or that some more incidents were taken into consideration while issuing the order of detention which are not disclosed in the grounds of detention and, therefore, obviously copies of which were not supplied to the detenu. This will obviously affect his right to make an effective representation. In this context, Shri Mundargi has rightly placed reliance upon the decision of this Court in Jivraj Joharmal v. The State, AIR 1956 Bom 719 : (1956 Cri LJ 1311). 3. In the result, therefore, the Rule is made absolute and the detenu is directed to be released forthwith, it not required in any other case. Petition allowed.