196a depends entirely upon the satisfaction of the appro- Shibban Lat priate authority specified in that section. The suffi- Saksena ciency of the grounds upon which such satisfaction v. purports to be ba~ed, provided they haYe a rational T.ht·. State of Utta.r probative value and are not extraneous to the scope Pracksh or purpose of the legislative provision cannot be mzct Other1t. challenged in a court of law, except on the ground of Mukherjea J. rnal,a fides(1 ). A court of law is not even competent to enquire into the truth or otherwise of the facts which are mentioned as grounds of detention in the communication to the detenu under section 7 of the Act. What has happened, however, in this case is somewhat peculiar. The Government itself, in its communication dated the 13th of March, 1953, has plainly admitted that one of the grounds upon which the original order of detention was passed is unsubstantial or nonexistent and cannot be made a ground of detention. The question is, whether in such circumstances the original order made nnder section 3 (1) (a) of the Act can be allowed to stand. The answer, in our opinion, can only be in the negative. The detaining authority gave here two grounds for detaining th e petitioner. \Ve can neither decide whether these grounds are good· or bad, nor can we attempt to assess in what manner and to what ex tent each of these grounds operated on the mind of the appropriate authority and contributed to the creation of the satisfaction on the basis of which the detention order was made. To say that the other ground, which still remains, is quite sufficient to sustain the order, would be to substitute an objective judicial test for the subjective decision of the executive authority which is against the legislative policy underl:ying the statute. In such cases, we think, the position would be the same as if one of these two grounds was irrelevant for the purpose of the Act or was wholly illusory and this would vitiate the detention order as a whole. This principle, which was recognised by the-Federal Court in the case of Keshav Talpa.de v. The King-Emper<nf), seems to us to be quite sound and applicable to the facts of this case.