and he applied those United States authorities which dealt with objects, rather than people. He did so on the basis that insofar as people were concerned, any contrary decisions in the United States depended upon reasonable expectations of privacy of the individual. I agree. Such an approach is a reflection of specific constitutional concepts in the United States that have no counterpart in Australia either by way of constitutional guarantee or in relevant legislation.
44 Having concurred with the reasons given by Olsson J, Prior J added:
"I agree in particular with the submission put by the Director of Public Prosecutions that mere sensory perception, whether by eye, ear or nose, cannot of itself constitute a search. It follows that odours which emit from a person's bag are exposed to the plain perception of the public at large. Thus a dog sniffing the area around a bag or parcel does not effect a search of that bag or parcel. It could perhaps be described as an act of identification, but certainly not a search." (supra at 224)
45 Williams J in holding that the use of the sniffer dog was not unlawful said:
"Sniffing around the luggage does not, relevantly constitute 'search'." (supra at 227)
46 Special leave to appeal from this decision was sought from the High Court. This was refused sub nom Hoare v The Queen (1999) 197 CLR 682 per Gleeson CJ and Callinan J.
47 One way of testing the conclusion expressed by Olsson J in paragraphs 42 and 43 above would be to take a situation in which an officer of police has a particularly sensitive sense of smell, or experienced a particular reaction to the presence of a certain substance, for example, cannabis. People who have allergies may well be in the latter category. Such particular characteristics or sensitivities may well cause the officer in question to form a suspicion as to the presence and hence possession of cannabis in a particular place, or on a particular person. In those circumstances there would, in my opinion, be nothing unreasonable about the formation by such officer of the suspicion appropriate to found a right of search. Having formed such suspicion, the powers conferred by s 37 of the Act could be exercised. I do not think that it could be said that the search began when he detected the odour of the cannabis. The detection of the odour is what caused him to form the relevant suspicion that proceeded and gave rise to the search. Nor do I think that the detecting by him of such odour before he formed a suspicion as to the presence of cannabis would render illegal any actions of his in searching the person he had detected as the source of such odour.
48 Another situation could be one in which the odour of cannabis is so strong, and its source so obvious, that even a person without special sensitivities or particular reactions would become aware of the presence and possession of the drug. In my opinion a search of a person based on such perception would not be unreasonable, and would not render a search of the person on whom the odour was detected, illegal.
49 The formation of a reasonable suspicion may not depend upon personal observation or sensation. It may depend, for example, on information conveyed to a police officer from some other source. That source may be another police officer. That source may be a private citizen. That source may be a dog. The reactions of the dog in such a case would be no more than a basis for the formation of a reasonable suspicion by the police officer. It does not seem to me that there is any difference in principle between information conveyed to a police officer by a fellow police officer or a private citizen on the one hand, and information conveyed to the police officer by the reactions of a trained drug detection dog on the other.
50 Senior counsel for the defendant further submitted that what was done by Rocky and what was done by Sergeant Gentle and Constable Schmidt constituted a search conducted as a result, and during the course, of a trespass to the person. In support of this submission he argued that whilst force is necessary for there to be trespass, such force can be as slight as a mere touch. However, as I have already determined, what was done by Rocky did not constitute a search. Furthermore, there is no finding by the Magistrate that what was done by Rocky constituted an assault. Indeed, the finding by the Magistrate was that Rocky "sniffed around the defendant's genital area, his trousers and his pockets and put his nose directly onto the outside of the defendant's pocket and sat down."
51 The Magistrate' decision did not turn upon there having been an assault. There is no suggestion in the finding of the Magistrate that there was any assault. There is no finding of the application of any force. The finding is that there was a "sniffing around" and a placing of the "nose onto the outside of the defendant's pocket". The basis of the Magistrate's decision was that the actions of the dog constituted a search.
52 In the course of the submissions made on behalf of the defendant, much use was made of the word "bunting". The evidence in relation to the use of that word at the hearing before the Magistrate is set out in paragraph 11 above, from which it can be seen that Senior Constable Richardson adhered to his evidence that the dog merely sniffed in the region of the defendant's genital organs and pocket, and placed his nose on the outside of the defendant's pocket.
53 The argument in support of the claim that what had been done by the dog constituted an assault depended upon the dog having "bunted" the defendant. Bunting is normally understood in this day and age as the cloth or like flags and colourful festive decorations that are frequently seen at Christmas and sometimes at Easter in shopping centres or at other times in used car sale yards. However, when used in relation to a person or animal it has the meaning of butting with the head or horns. The Magistrate did not find that Rocky had bunted (in the sense of head-butted) the defendant. Indeed, her finding was that "the dog flared its nostrils, sniffed the air and then … bunting and ferreting, sniffed about until he headed straight towards the defendant" (italics added). Thus, the bunting and ferreting occurred when Rocky was at some remove from the defendant and before "he headed straight towards the defendant". The finding by the Magistrate is inconsistent with other than a sniffing around by Rocky in the vicinity of certain areas of the defendant's body and clothing. It is certainly not a finding of assault.
54 As was conceded on behalf of the defendant, not every touching of an individual, even by another individual, constitutes an assault. No doubt, he had in mind statements of the law such as that which is to be found in Hawkins' Pleas of the Crown (1716), Ch LXII, s2, p 134 which refer to actions "actually done to the Person of a Man, in an angry or revengeful or rude or insolent manner as by Spitting in his Face, or any Way touching him in anger or violently jostling him out of the way." (See Regina v Phillips (1971) 45 ALJR 467 at 472; Boughey v The Queen (1986) 161 CLR 10 at 25, 38-39). As Olsson J said, in my opinion correctly, in Questions of Law Reserved (No. 3 of 1998) (supra at 227), a mere act of sniffing in the vicinity of a person or object involves no trespass. Just as "the eye cannot … be guilty of a trespass" (Entick v Carrington (1765) 19 State Tr 1029 at 1067 per Lord Camden CJ), "nor can the ear" (Malone v Commissioner of Police (No. 2) (1979) 2 All ER 620 at 640 per Megarry V-C), nor can the sniffing of a nose, even if the nose be that of a trained police drug detection dog.
55 In the course of giving illustrations as to why the touching of the defendant by Rocky on his pocket or sniffing in the area of his genital organs constituted an assault and for that reason part, or the origin, of an illegal search, senior counsel for the defendant submitted that:
"If your Honour were to do as this dog did and nuzzle the defendant's genitals, it would be an indecent assault."
56 It is unnecessary for the purposes of this decision to resolve that question. The line between that which is merely eccentric and that which constitutes an assault - whether indecent or otherwise - need not be drawn in this case. There was no finding of assault. Furthermore, acts that might constitute an indecent assault if perpetrated by one human being on another, may well be characterised quite differently if performed by one dog on another, or by a dog on a human. When a "crotch nuzzle" (as senior counsel for the defendant so delicately described the relevant actions of Rocky) is performed by a dog in relation to a human being, it may be no more than a conventional, friendly, social gesture with no hostile intent, and unlikely to constitute an assault - whether indecent or otherwise.
57 In the absence of any finding of assault, the submission made on behalf of the defendant and referred to in paragraph 50 above fails. On the evidence before the Magistrate the search that was carried out by Sergeant Gentle or Constable Schmidt followed the formation by them of the opinion necessary to exercise the powers conferred by s 37(3) of the Act. The formation of that opinion was not vitiated by the fact that the information on which the relevant opinion was based resulted from the actions of Rocky.
58 In my opinion, the Magistrate erred in law in finding that the actions of Rocky constituted a search and thus rendered the actions of Sergeant Gentle and Constable Schmidt illegal.
59 During the course of the hearing, reference was made to the Police Powers (Drug Detection Dogs) Act 2001 (Act No 115 of 2001). This Act was assented to on 14 December 2001 and proclaimed to commence on 22 February 2002. It was common ground between the parties that such Act had no application in the present case. However, it should be noted that the Act uses the term "general drug detection" which is defined as "the detection of prohibited drugs or plants in possession of a person, except during the search of a person that is carried out after a police officer reasonably suspects that the person is committing a drug offence." The application of this Act and its impact, if any, in relation to s 37 of the Drug Misuse and Trafficking Act 1985 is yet to be tested, but such considerations do not impact on the outcome of this matter.