“Where a constable has reasonable grounds for suspecting that an arrestable offence has been committed, he may arrest without a warrant anyone whom he has reasonable grounds for suspecting to be guilty of the offence.”
“1) Did the arresting officer suspect that the person who was arrested was guilty of the offence? The answer to this question depends entirely on the findings of fact of the officer’s state of mind. 2) Assuming the officer had the necessary suspicion, was there reasonable cause for that suspicion? This is a purely objective requirement to be determined by the Judge if necessary on facts found by a jury. 3) If the answer to the previous two questions is in the affirmative, then the officer has a discretion which entitled him to make an arrest and in relation to that discretion the question arises as to whether the discretion has been exercised in accordance with the principles laid down … in … Wednesbury …”
“40 … the word “facts” must not be given a restrictive meaning. It clearly includes information, as was the view of the European Court of Human Rights in Fox, Campbell and Hartley; and information can be information obtained from a third party … the decision in Hussein is instructive in that the Privy Council clearly took the view that the police were entitled to arrest both, even though only one of them could have been the driver. 41. In my view, there is nothing in principle which prevents opportunity from amounting to reasonable grounds for suspicion. Indeed in some circumstances opportunity may be sufficient to found a conviction. That would be the case where the prosecution can prove that no one else had the opportunity to commit the offence. The question in the present case is whether opportunity is sufficient to be reasonable grounds for suspecting six people when the likelihood is that it was only one or perhaps two of those six who were responsible. Again there can be nothing in principle wrong with arresting more than one person even if the crime can only have been committed one person: see Hussein. Where a small number of people can be clearly identified as the only ones capable of having committed the offence, I see no reason why that cannot afford reasonable grounds for suspecting each of them of having committed that offence, in the absence of any information which could or should enable the police to reduce the number further. ….”
“As Lord Devlin pointed out in Hussein’s case … in underlining the distinction between reasonable suspicion and prima facie proof, prima facie proof consists of admissible evidence. Suspicion can take into account matters that could not be put in evidence at all. Thus by way of example only, the arresting officers were entitled to have regard to the evidence (insofar as it concerned a particular claimant) as to the Schwarzschild safe deposit box. ….”
“… that a reasonable man would have been of the opinion that, having regard to the information which was in the mind of the arresting officer, there were reasonable grounds for suspecting Mr ….to be guilty of theft and criminal damage jointly with others. I emphasise the distinction between reasonable suspicion and prima facie proof. Several of the matters referred to above were highly suspicious.”
“Where for the purpose of assisting with an investigation a person attends voluntarily at a police station … without having been arrested - (a) he shall be entitled to leave at will unless he is placed under arrest; (b) he shall be informed at once that he is under arrest if a decision is taken by a constable to prevent him from leaving at will” (a) he shall be entitled to leave at will unless he is placed under arrest; (b) he shall be informed at once that he is under arrest if a decision is taken by a constable to prevent him from leaving at will”
“(a) The preferred operational strategy of the Metropolitan Police is to arrest a suspect and interview him at a police station. (b) If a suspect is particularly vulnerable, such as a child or somebody who is mentally or physically unwell there may be sensible reasons for making alternative arrangements. (c) A[n] interview at a police station gives the police a degree of control over the suspect[‘]s movement. Should an interview occur without arrest somewhere other than at a police station the interviewee could leave the interview whenever he wishes. [I interpolate that, as Mr Rees also said in conference and in evidence, that to arrest at that point would leave the police open to criticism that they were arresting simply to persuade an interviewee to answer questions.] (d) Although solicitors acting on Mr Al Fayed’s behalf have indicated that he would provide fingerprints without the need for arrest there would be nothing to stop him changing his mind. (e) An interview room at a police station has proper tape-recording facilities. (f) It is intended to arrest others in connection with the enquiry who are not as prominent as Mr Al Fayed. It might be contended that they also be afforded the same privilege [sic]; (g) In a case such as this the police must be seen to be acting in an even-handed way. To do otherwise would create a precedent whereby prominent individuals could demand the same exceptional treatment; and (h) I am told that arrangements are in place that will ensure Mr Al Fayed is not subjected to the ‘media-circus’ about which fears have been expressed.”
“… the preferred operational strategy of the Metropolitan Police was a reference to the preferred police strategy to be adopted in the case. Further, it is admitted and averred it is normal police practice to arrest persons suspected of arrestable criminal offences at a police station.”
“262. As to the allegation that the defendants took into account matters which they ought not to have taken into account, namely a fictitious ‘preferred Metropolitan Police operational strategy’ to arrest a suspect and interview him at a police station, rather than conducting an interview without arrest, I find that no such matter was taken into account. On25 February 1998 Mr Rees asked Miss Hyams to obtain Treasury Counsel’s opinion on [inter alia] the preferred operational strategy of the Metropolitan Police to arrest Mr Al Fayed and his colleagues at a police station. I find that the reference in the file note to ‘the preferred operational strategy of the MPS’ meant in context the preferred operational strategy of the MPS in the present case. “263. As to the allegation that the defendants took into account matters which they ought not to have taken into account namely a ‘normal’ Metropolitan Police practice to arrest all those suspected of having committed an arrestable offence, save those who were infirm or vulnerable, without regard to the circumstances of the particular case, I find that each of the arresting officers (and Mr Rees) weighed all the circumstances of this particular case with care (including without limitation all the points made orally and in the extensive correspondence by Burton Copeland). Further legal advice was sought from the Metropolitan Police Solicitor’s Department and from Senior Treasury Counsel. Mr Pownall was asked to advise as to whether Mr Rees should exercise his discretion in favour of arrest or in favour of what was proposed by Mr Burton. The arresting officers did not say ‘I always arrest when I have reasonable grounds for suspecting a person to be guilty of an arrestable offence’ (see Neilson v Attorney General[2001] 3 NZLR 433 , at 441, Richardson P). The many points made by Mr Burton were weighed by the … team with DI Taber acting as devil’s advocate. The arresting officers were entitled to take into account a concern that if the claimants were not arrested and walked out in the course of an interview, any attempt to arrest them at that stage would or might be questionable or open to the subject of challenge. … 266. The discretion was exercised in accordance with Wednesbury principles. The decisions in each case to arrest were not perverse. The arresting officers exercised their discretion in each case. They did not fail to take account of the relevant. They did not take account of the irrelevant.”
“(c) the lawful arrest or detention of a person effected for the purpose of bringing him before the competent legal authority on reasonable suspicion of having committed an offence or when it is reasonably considered necessary to prevent his committing an offence or fleeing after having done so;”
“So, applying Wednesbury principles, the question of law to be decided by your Lordships may be identified as this: ‘Was it a matter Detective Constable Offin should have excluded from his consideration as irrelevant to the exercise of his statutory power of arrest, that there was a greater likelihood (as he believed) that Mrs Holgate-Mohammed would respond truthfully to questions about her connection with or knowledge of the burglary, if she were questioned under arrest at the police station, than if, without arresting her, questions were put to her by Detective Constable Offin at his own home from which she could peremptorily order him to depart at any moment …”
“If the custody officer has reasonable grounds for so believing, he may authorise the person arrested to be kept in police detention.”
“… Given the information provided by the arresting officer (and the absence of any representation to the contrary by the solicitor for the claimant concerned) I find that this decision of the custody officer in each case was reasonable. It was certainly not unreasonable, in the sense that no custody officer applying his common sense to information before him, could reasonably have reached that decision.”
“Following a decision to arrest a suspect, they [sic] must not be interviewed about the relevant offence except at a police station or other authorised place of detention …”
“… should ask itself the question ... whether the decision of the custody sergeant was unreasonable in the sense that no custody officer, acquainted with the ordinary use of language and applying his common sense to the competing considerations before him, could reasonably have reached that decision. Applying that test in this case, I bear in mind that what was being suggested was a comparatively short period of detention, so that the officers, having checked with … the complainant … whether or not there had been, for example, one telephone call about money or whether the appellant did in fact owe him any money, might then continue the interview, or restart the interview, for the purpose they had contended they had, which was obtaining evidence relating to the offence by questioning her. Looking at the matter from that standpoint, it seems to me that the custody officer could reasonably, in the circumstances of this case, have come to the conclusion that he had reasonable grounds for believing that the detention of the appellant without being charged was necessary within the meaning of the section. …”
“where statutory provisions which provide rights to police constables to interfere with the liberty of the subject are concerned, those provisions ought to be construed strictly against those purporting to exercise those rights.”