Under what circumstances are you required to stop and/or answer questions by the police? After this case of suspected harassment by the police in England in response to refusal to provide a name while walking to catch a train I wondered when you are required to stop, and when you are required to answer questions as a pedestrian. From the linked pages, it would seem the answer is that you are not required to answer any questions. You are required to stop if you are either legally arrested or are going to be searched. To be legally arrested the police must: identify themselves as the police tell you that you’re being arrested tell you what crime they think you’ve committed explain why it’s necessary to arrest you explain to you that you’re not free to leave To detain you for a search the police must tell you: their name and police station what they expect to find, for example drugs the reason they want to search you, for example if it looks like you’re hiding something why they are legally allowed to search you that you can have a record of the search and if this isn’t possible at the time, how you can get a copy From my reading, unless all of one of these sets of actions have been completed, you are allowed to continue about your business as if the police were not there. Is this interpretation correct?
Is this interpretation correct? YES Encounters such as this should normally fall within the non-statutory stop &amp; account which covers police-initiated conversations with members of the public to ask general questions about their activities when there are no reasonable grounds to suspect an offence. The terminology varies from Force to Force, but can be summarised as: What are you doing? Why are you in the area? Where are you going? What are you carrying? There is no legal requirement or obligation to answer any of these questions, and the police cannot lawfully detain anyone to ask them - unlike the statutory powers under Stop &amp; Search and Arrest covered by the OP.
Police are not required to tell you their name From this response to a FOI request: There is no specific written requirement for Police Officers to verbally give their name and/or number to a member of the public if verbally requested to do so. However Police Officers are required to comply with the Police Code of Ethics, which is overseen and published by the College of Policing. However, it goes on to say that, subject to certain exemptions, uniformed police must wear a name badge and display their number on their epaulettes.
Self-defence has nothing to do with whether you are performing an arrest (lawful or otherwise) Self-defence is a plea that you used reasonable force to protect yourself, others and in some jurisdictions, property, from immediate harm. There is, as you say, a “whole spectrum” of both the perception of the threat and the force used that go into determining if the actions of the defendant amounted to self-defence or not. That’s why it’s up to the jury to decide on a case by case basis. A person who has the power of arrest (law enforcement officers and citizens who actually witness a crime) is authorised to use reasonable force to effect that arrest. Of course, effecting an arrest may cause a situation to escalate to the point where self-defence becomes an issue.
Silence is not cause. However, this may not prevent a search. The officer does not need to tell you that he has probable cause, he must simply have it in order to conduct a search. If he obtained the probable cause before he pulled you over (this is likely), then he will order you out of the car and search over your vociferous (and silent?) objections. If the officer does not have probable cause, searches anyway, and can't come up with a convincing one in time for the court date, then yes you have a claim. But remember, just because the officer didn't inform you of the cause doesn't mean it didn't exist. Always consult an attorney before any legal action.
Police have discretion in the enforcement of the law Which is to say, police get to decide which crimes they make arrests for, which they handle with warnings, which they report and which they ignore. This applies whether they are in uniform, undercover or off-duty. If they abuse this discretion then they are liable to disciplinary action. If they apply it corruptly or otherwise illegally then they are liable to criminal sanction.
An existing law actually prohibits using census data "against" a person, see this recent question. The 5th Amendment ("nor shall be compelled in any criminal case to be a witness against himself") is not interpreted to imply an absolute privilege to not answer, it means that your answer cannot be used against you in a criminal case. You can be compelled to testify "against yourself" if you are granted immunity from prosecution.
Is mere accusation without evidence other than testimony of the accuser, grounds for arrest in the UK? It depends on the circumstances, especially when dealing with non-recent allegations where independent and corroborative evidence may be difficult to locate and/or recover, but in my experience it is very rarely an option to arrest soley on the say-so of one complainant unless there is a compelling reason to do so. It's also fraught with potential risks - Operation Midland being a prime example of when it can go horribly wrong. Also, no-one can &quot;call the police and have someone arrested&quot; in the united-kingdom - the police are under a duty to carry out a &quot;proportionate investigation&quot; in to allegations of crime and then make their own minds up on how to proceed based on the available intelligence and evidence. Focussing on england-and-wales, the most commonly used power of arrest* is at s.24 of the Police and Criminal Evidence Act 1984 which, along with PACE Code G, requires an officer to: Reasonably suspect that an offence is being, has been or will be committed. On a scale of 0 to 10 - with 10 being total knowledge and 0 being no opinion at all - suspicion may be as low as 2 or 3 whereas belief starts at 7 or 8. And reasonably believe an arrest is necessary. One commonly used mnemonic for the Necessity Test under s.24 is: ID COP PLAN: Investigation - prompt and effective investigation of offence or conduct Disappearance - prevent prosecution being hindered by disappearance of a person Child / Vulnerable person - protection of Obstruction of highway Physical injury to themselves or someone else Public (in)decency Loss or damage to property Address not know Name not known I cannot say why the officer did not make an arrest in the OP's case. I surmise that he did not deem it necessary based on the above mandatory criteria but rather considered that a voluntary attendance interview would be the most appropriate course of action given the circumstances and information available to him at the time. *There are other statutory and common-law powers of arrest, but they all follow the same procedures as above
Nothing is typical Investigators have wide discretion on how (and if) they pursue an investigation of an alleged crime. When they make an arrest is part of that discretion. Making an arrest starts all sorts of clocks running on the legal process and investigators may not want to do that for all sorts of legitimate reasons.