1. This is an appeal by the State of Bombay, with the special leave of this Court, against the order of acquittal by the High Court of Bombay of the respondent, Vishnu Ramchandra, who was prosecuted under section 142 of the Bombay Police Act and sentenced to six months' rigorous imprisonment by the Presidency Magistrate, 2nd Court, Mazagaon, Bombay.
2. On November 16, 1949, Vishnu Ramchandra was convicted under sections 380 and 114 of the Indian Penal Code, and sentenced to one month's rigorous imprisonment. On October 15, 1957, the Deputy Commissioner of Police, Bombay, acting under section 57(a) of the Bombay Police Act (22 of 1951), passed an order against Vishnu Ramchandra which was to operate for one year, externing him from the limits of Greater Bombay. At that time, a prosecution under section 411 of the Indian Penal Code was pending against. Vishnu Ramchandra, and he was not immediately externed, to enable him to attend the case. This prosecution came to an end on July 10, 1958, and resulted in him acquittal. Immediately afterwards, a constable took him outside the limits of Greater Bombay, and left him there. The prosecution case was that he returned to Greater Bombay, and was arrested at Pydhonie on August 24, 1958. He was prosecuted under section 142 of the Bombay Police Act. His plea that he was forcibly brought back to Pydhonie and arrested was not accepted by the Presidency Magistrate, and he was convicted.
3. He filed a revision application, which was heard by a learned single Judge of the High Court of Bombay. There contentions were raised before the High Court. The first was that the Deputy Commissioner of Police had not applied his mind to the facts of the case before making the order of externment. The second was that section 57 of the Bombay Police Act was prospective, and could not be made applicable, unless the conviction on which the action of externment was based, took place after the coming into force of that Act. The third was that the belief entertained by the Deputy Commissioner that Vishnu Ramchandra was likely to engage himself in the commission of an offence similar to that for which he was prosecuted was based on the prosecution which was then pending, and that that ground disappeared after his acquittal. The High Court did not consider the first and the third ground, because it held that the second ground was good.
4. Section 57 of the Bombay Police Act reads as follows :
'Removal of persons convicted of certain offences. -
If a person has been convicted -
(a) of an offence under Chapter XII, XVI or XVII of the Indian Penal Code (XLV of 1860), or
(b) twice of an offence under section 9 or 23 the Bombay Beggars Act, 1945 (Bom. XXIII of 1945,) or under the Bombay Prevention of Prostitution Act, 1923 (Bom. XI of 1923), or
(c) thrice of an offence within a period of three years under section 4 or 12A of the Bombay Prevention of Gambling Act, 1887 (Bom. IV of 1887), or under the Bombay Prohibition Act, 1949 (Bom. XXV of 1949) the Commissioner, the District Magistrate or the Sub-Divisional Magistrate specially empowered by the State Government in this behalf, if he has reason to believe that such person is likely again to engage himself in the commission of an offence similar to that for which he was convicted, may direct such person to remove himself outside the area within the local limits of his jurisdiction, by such route and within such time as the said officer may prescribe and not to enter or return to the area from which he was directed to remove himself'.
5. In reaching the conclusion, the learned single Judge observed that the legislature had used the present participle 'has been' and not the past participle in the opening portion of the section, and that this indicated that the section was intended to be used only where a person was convicted subsequent to the coming into force of the Act. He further observed that being a penal section, it had to be interpreted prospectively. He repelled an argument of the Assistant Government Pleader that section 57 merely re-enacted the provisions of section 27 of the City of Bombay Police Act, 1902, and that a liability incurred under the older Act was preserved by section 167 of the Bombay Police Act of 1951. Observing further that the Deputy Commissioner of Police of at the time of the passing of the order could not be said to have entertained a belief about the activities of Vishnu Ramchandra based upon his conviction in the year 1949, he held that the order of externment must be regarded as invalid for that reason and also on the ground that the conviction was not after the coming into force of the Act.
6. At the hearing before us, the respondent was to represented. We have heard Mr. Dhebar in support of the appeal, and, in our opinion, the High Court was not right in the view it had taken of section 57 of the act. The question whether an enactment is meant to operate prospectively a or retrospectively has to be decided in accordance with well-settled principles. The cardinal principle is that statutes must always be interpreted prospectively, unless the language of the statutes makes them retrospective, either expressly or by necessary implication. Penal statutes which create new offences are always prospective, but penal statutes which create disabilities, though ordinarily interpreted prospectively, are sometimes interpreted retrospectively when there is a clear intendment that they are to be applied to past events. The reasons why penal statutes are so construed was stated by Erle, C.J., in Midland Rly. Co. v. Pye 10 C.B. (N.S.) 179 in the following words :
'Those whose duty it is to administer the law very properly guard against giving to an Act of Parliament a retrospective operation, unless the intention of the legislature that it should be so construed is expressed in clear, plain and unambiguous language; because it manifestly shocks one's sense of justice that an act, legal at the time of doing it, should be made unlawful by some new enactment'.
7. This principle has now been recognised by our Constitution and established as a Constitutional restriction on legislative power.
8. There are, however, statutes which create no new punishment, but authorise some action based on past conduct. To such statutes, if expressed in language showing retrospective operation, the principle is not applied. As Lord Coleridge, C.J., observed during the course of arguments in Rex v. Birthwhistle (1889) 58 L.J. (N.S.) M.C. 158 :
'Scores of Acts are retrospective, and may without express words be taken to be retrospective, since they are passed to supply a cure to an existing evil.' Indeed, in that case which arose under the Married Women (Maintenance in Case of Desertion) Act, 1886, the Act was held retrospective without express words. It was said : 'It was intended to cure an existing evil and to afford to married women a remedy for desertion, whether such desertion took place before the passing of the Act or not.'
9. Another principle which also applies is that an Act designed to protect the public against acts of a harmful character may be construed retrospectively, if the language admits such an interpretation, even though it may equally have a prospective meaning. In Queen v. Vine  10 Q.B. 195 which dealt with the disqualification of persons selling spirits by retail if convicted of felony, the Act was applied retrospectively to persons who were convicted before the Act came into operation. Cockburn, C.J., observed :-
'If one could see some reason for thinking that the intention of this enactment was merely to aggravate the punishment for felony by imposing this disqualification in addition, I should feel the force of Mr. Poland's argument, founded on the rule which has obtained in putting a construction upon statutes - that when they are penal in their nature they are not to be construed retrospectively, if the language is capable of having a prospective effect given to it and is to necessarily retrospective. But here the object of the enactment is not to punish offenders, but to protect the public against public houses in which spirits are retailed being kept by persons of doubtful character... On looking at the Act, the words used seem to import the intention to protect the public against persons convicted in the past as well as in future; the words are in effect equivalent to 'every convicted felon'.'
10. In the same case, Archibald, J., expressed himself forcefully when he observed :-
'I quite agree, if it were simply a penal enactment, that we ought not to give it a retrospective operation; but it is an enactment with regard to public and social order, and infliction of penalties is merely collateral.'
11. Similarly, in Ex Parte Pratt  12 Q.B. 334 which dealt with the words 'a debtor commits an act of bankruptcy' to enable the Court to make a receiving order, Cotton, L. J., gave the words a retrospective operation, observing :-
'I think that no reliance can be placed on the words 'commits' as showing that only acts of bankruptcy committed after the Act came into operation are intended.'
12. In the same case, the observations of Bowen, L. J., were :-
'I think that the more the Act is studied the more it will be found that it is framed in a very peculiar way. I do not mean to say that it is inartistically framed. I think it is framed on the idea that a bankruptcy code is being constructed, and when the present tense is used, it is used, not in relation to time, but as the present tense of logic.'
13. Fry., L.J., added :-
'I entirely agree with Bowen, L. J., as to the meaning of the present tense in the section; it is used, I think, to express a hypothesis, without regard to time.'
14. In Bourke v. Nutt  1 Q.B. 725 Lord Esher, M. R., speaking of these observations of Bowen and Fry, LL. J., observed :-
'... the case seems to show that when the present tense is used in this statute (section 32 of the Bankruptcy Act, 1883) the time to be considered is the time at which the Court has to act, and not the time at which the condition of things on which it has to act came into existence.'
15. Applying the above principles, Lord Esher, M. R., held that the section was not retrospective but prospective, because the important time was that at which it had to be considered whether the person was disqualified and it related to a time after the passing of the Act. He, however, added that 'even if it could be said that it is retrospective, its enactments are solely for the public benefit, and the rule that restricts the operation of a penal retrospective statute does not apply, because this statute is not penal.'
16. These principles, though not unanimously expressed, have been accepted in later cases both in England and in India. In Ganesan v. A. K. Joscelyne : AIR1957Cal33 , Chakravarti, C.J., observed, Sarkar, J. (as he then was), concurring :-
'I may state, however, that in spite of the ordinary and I might almost say cardinal rule of construction that statutes, particularly statutes creating liabilities, ought not to be so construed as to given them a retrospective operation unless there is a clear provision to that effect or a necessary intendment implied in the provisions, there is another principle on which Courts have sometimes acted. It has been held that where the object of an Act is not to inflict punishment on anyone but to protect the public from undesirable persons, bearing the stigma of a conviction or misconduct on their character, the ordinary rule of construction need not be strictly applied.'
17. In Taher Saifuddin v. Tyebbhai Moosaji : AIR1953Bom183 , the same principles were applied by Chagla, C.J. and Bhagwati, J. (as he then was), and reference was made also to Then Queen v. Inhabitants of St. Mary Whitechapel  12 Q.B. 120 (B) : 116 E.R. 811 where Lord Denman, C.J., in his judgment observed :-
'... it was said that the operation of the statute was confined to persons who had become widows after the Act passed, and that the presumption against a retrospective statute being intended supported this construction; but we have before shown that the statute is in its direct operation prospective, as it relates to future removals only, and that it is not properly called a retrospective statute because a part of the requisites for its action is drawn from time antecedent to its passing.'
18. Now, section 57 of the Bombay Police Act, 1951, does not create a new offence nor makes punishable that which was not an offence. It is designed to protect the public from the activities of undesirable persons who have been convicted of offences of a particular kind. The section only enables the authorities to take not of their convictions and to put them outside the are of their activities, so that the public may be protected against a repetition of such activities. As observed by Phillimore, J., in Rex v. Austin  1 K.B. 551
'No man has such a vested right in his past crimes and their consequences as would entitle him to insist that in no future legislation shall any regard whatever be had to his previous history.'
19. An offender who has been punished may be restrained in his acts and conduct by some legislation, which takes note of his antecedents; but so long as the action taken against him is after the Act comes into force, the statute cannot be said to be applied retrospectively. The Act in question was thus not applied retrospectively but prospectively.
20. It remains only to consider if the language of the section bars an action based on past actions before the Act was passed. The verb 'has been' is in the present perfect tense, and may mean either 'shall have been' or 'shall be'. Looking, however, to the scheme of the enactment as a whole and particularly the other portions, of it, it is manifest that the former meaning is intended. The verb 'has been' describes past actions, and, to borrow the language of Fry, L.J., in Ex Parte Pratt  12 Q.B. 334 'is used to express a hypothesis, without regard to time'.
21. An externment order, however, to satisfy the requirements of section 57 of the Bombay Police Act, must be made bona fide, taking into account a conviction which is sufficiently proximate in time. Since no absolute rule can be laid down, each case must depend on its own facts.
22. In the result, we set aside the acquittal, and remit the case to the High Court for disposal on the other points urged before it and in the light of observations made here by us.
23. Appeal allowed.