An arrest for knife possession in London can result in police questioning, continued detention, criminal charges and potentially a court case. The outcome does not depend solely on whether officers found a knife. The type of article, where it was discovered, why it was being carried and whether the person had lawful authority or a good reason may all affect the case.
Being arrested is not the same as being convicted. The prosecution must still prove the alleged offence, and the accused person may be able to dispute possession, challenge the evidence or provide a legally recognised explanation.
This guide explains what generally happens after you are arrested for knife possession in London under the criminal law of England and Wales.
What Is Considered Knife Possession in London?
Section 139 of the Criminal Justice Act 1988 makes it an offence to have an article with a blade or sharp point in a public place without good reason or lawful authority.
A public place can include a road, park, railway station, shopping centre, public transport or another location to which members of the public have access. Different provisions apply to possessing bladed articles or offensive weapons on school premises.
In a typical public-place possession case, the prosecution may need to establish that:
- The person had the article with them
- The article had a blade or sharp point
- The person was in a public place
- No applicable legal exception prevented the conduct from being an offence
The law contains a limited exception for certain folding pocketknives with a cutting edge not exceeding three inches. This exception generally does not cover lock knives, and even a qualifying pocketknife may be unlawful when it is carried as a weapon.
The Crown Prosecution Service guidance on knives and offensive weapons explains how prosecutors assess bladed-article and offensive-weapon allegations.
Can Police Stop and Search You for a Knife?
Police officers may stop and search a person when an applicable legal power permits it. This can include situations in which an officer has reasonable grounds to suspect that the person is carrying a weapon, stolen property or another prohibited item.
An officer conducting a stop and search should generally provide certain information, including:
- Their name or identification number
- The police station to which they are attached
- The legal power being used
- The object of the search
- The grounds for the search
- Information about obtaining a record of the search
The officer does not need to prove that a person possesses a knife before conducting every lawful search. However, the search must be supported by a recognised police power and performed according to the applicable rules.
The Metropolitan Police publishes information about London searches, arrests and knife-enabled crime through its statistics and data service.
Questions about the legality of a search should normally be addressed through legal procedures. Physically resisting an officer can create further risks and may lead to additional allegations.
What Happens Immediately After the Arrest?
Someone arrested for suspected knife possession will usually be taken to a police station. The knife or alleged weapon may be seized, photographed, examined and preserved as evidence.
A custody officer must decide whether detention is authorised. The arrested person may be searched, while personal belongings may be recorded and stored. Police may also take fingerprints, photographs and, when legally permitted, a DNA sample.
The custody process may involve:
- Confirming the person’s identity
- Recording the reason for arrest
- Assessing medical and welfare needs
- Explaining the person’s rights
- Arranging legal advice
- Collecting and reviewing evidence
- Conducting an interview under caution
- Deciding whether to release, bail or charge the person
Our general guide explaining what happens after an arrest provides additional background about the arrest process. That article discusses the United States, so its terminology and procedures should not be treated as a description of the England and Wales criminal justice system.
How Long Can Police Keep You in Custody?
Police can normally detain an arrested person for up to 24 hours before they must charge or release them. Detention may be extended in certain serious cases, but additional legal requirements must be satisfied.
Continued detention is not supposed to be automatic. The necessity of keeping someone in custody must be reviewed at specified points.
Official GOV.UK guidance on detention after arrest explains that police may seek authority to hold someone for up to 36 or 96 hours in certain serious cases. Separate rules apply to arrests under terrorism legislation.
An allegation involving knife possession does not necessarily mean that the person will remain at the police station for the maximum permitted period.
Do You Have the Right to a Solicitor?
A person detained at a police station has the right to request free and independent legal advice. This assistance is available regardless of the person’s income and whether the investigation eventually results in a charge.
Asking to speak with a solicitor does not suggest guilt. A criminal defence solicitor can:
- Explain the suspected offence
- Obtain information about the allegation from the police
- Advise whether and how to answer questions
- Attend the police interview
- Identify possible explanations or defences
- Raise concerns about detention or treatment
- Help ensure the suspect’s account is accurately presented
The arrested person may ask for the duty solicitor or request a particular criminal defence solicitor. Police should generally allow someone who requests legal advice an opportunity to receive it before an interview begins.
The government’s notice of rights and entitlements in police custody confirms that police-station legal advice is free and normally available at any time of day or night.
What Happens During the Police Interview?
Police may conduct a formally recorded interview under caution. The caution warns the suspect that they do not have to say anything, but it may harm their defence if they fail to mention something that they later rely on in court. Anything they do say may be given in evidence.
Questions during the interview may concern:
- Who owned the knife
- Where the knife was discovered
- Whether the suspect knew it was present
- Why the person had it
- How long it had been in their possession
- Where the person was going
- Whether the article was required for work
- Whether anyone had been threatened
- Whether the suspect intended to use the article
- Messages or photographs stored on a phone
- CCTV or witness evidence
- Previous relevant convictions
Remaining silent is not necessarily the correct approach in every case. Courts in England and Wales may sometimes draw an adverse inference when a defendant later relies on a fact that was not mentioned during questioning.
However, giving an inaccurate, speculative or poorly explained answer may also damage the defence. A solicitor can review the available information and advise whether the suspect should answer questions, provide a prepared statement or use another appropriate approach.
What Evidence Can Be Used in a Knife-Possession Case?
The physical knife is usually an important piece of evidence, but it may not be the only evidence. Investigators may also consider where the article was found, who controlled it and why it was allegedly being carried.
Evidence may include:
- Police body-worn camera footage
- CCTV recordings
- Statements from police officers
- Independent witness accounts
- Photographs of the knife
- Fingerprint or DNA evidence
- Statements made during the arrest
- Answers given in the police interview
- Mobile phone messages
- Social media activity
- Search records
- Travel or employment information
- Evidence about other alleged offences
The exact location of the knife may be particularly important. A knife discovered in someone’s hand, pocket or waistband may create different evidential questions from one found in a shared vehicle, communal area or another person’s bag.
Possession does not always depend on legal ownership. Prosecutors may try to prove that the defendant knowingly controlled the article even when it belonged to someone else.
Our article on evidence in a criminal case explains several common categories of criminal evidence. That guide is US-focused, so the specific rules of England and Wales must be considered in a London knife-possession case.
Is Having a Knife in London Always Illegal?
Having a knife is not automatically illegal in every circumstance. The law recognises limited exceptions as well as the defence of good reason or lawful authority.
Examples specifically recognised by legislation can include carrying a bladed article:
- For use at work
- For religious reasons
- As part of a national costume
Other circumstances may potentially constitute a good reason, but the explanation must be evaluated using the facts of the individual case.
A chef carrying professional knives directly to work may have a very different explanation from someone carrying the same knife during an unrelated night out. How the knife was packaged, the route being taken, the time of day and what the person said when stopped may all be relevant.
A defendant relying on good reason or lawful authority generally bears the burden of establishing it on the balance of probabilities. Documents and other evidence supporting the explanation can therefore be important.
Relevant evidence might include:
- Work schedules
- Employer confirmation
- Receipts
- Travel records
- Messages explaining the journey
- Religious evidence
- Witness statements
- Information showing how the knife was transported
Having a possible explanation does not guarantee that the police will release the person or that the court will accept the defence.
Is Self-Defence a Good Reason for Carrying a Knife?
Carrying a knife because someone fears being attacked does not ordinarily provide a general legal right to carry it for protection. An everyday article may also be classified as an offensive weapon when it is carried with the intention of causing injury.
Someone who has received threats should seek assistance through lawful protective measures rather than assume that carrying a knife will be legally excused.
The situation may be more complicated when someone claims they only briefly took possession of a knife during an immediate incident or removed it to prevent harm. Such cases depend heavily on timing, intention, surrounding events and what the person did afterward.
What Is an Offensive Weapon?
An offensive weapon is commonly placed into one of three broad categories:
- An article made for causing injury
- An everyday article adapted to cause injury
- An article carried with the intention of causing injury
A kitchen knife can be a bladed article even though it was originally manufactured for cooking. An ordinary object can potentially become an offensive weapon when it has been altered or is carried with the intention of injuring someone.
The classification of the item may affect:
- The exact charge
- What the prosecution must prove
- The available defence
- The seriousness of the allegation
- The possible sentence
A solicitor may examine the article itself, police photographs and the circumstances in which it was discovered.
What Happens After the Police Interview?
Police and, where required, the Crown Prosecution Service will consider the available evidence after the interview. Several outcomes are possible.
Release With No Further Action
The person may be released without being charged when the evidence is insufficient or further proceedings are not considered appropriate.
“No further action” means that a charge is not being pursued at that time. It does not necessarily erase the fact that an arrest occurred.
Release Under Investigation
The suspect may be released while the police continue investigating. There may be no fixed date for returning to the police station, but the investigation remains open.
Further work might include reviewing CCTV, examining a mobile phone, obtaining witness statements or seeking forensic results.
Release on Pre-Charge Bail
The suspect may be released on bail and told to return to a police station on a specified date. Conditions may be imposed when legally justified.
Possible conditions could restrict contact with certain individuals or prevent the person from entering a particular location.
Out-of-Court Resolution
An out-of-court resolution may be considered in limited circumstances. Knife and weapon allegations are treated seriously, so availability depends on the offence, evidence, criminal history and applicable guidance.
Formal Charge
Police may charge the suspect with possessing a bladed article or offensive weapon. Additional charges may be considered when the evidence suggests that the article was used to threaten or injure someone or was connected to another alleged offence.
Will You Be Released After Being Charged?
A person who is formally charged may be released on bail to attend court or kept in custody for the next available court hearing.
The decision may be affected by concerns that the defendant could:
- Fail to attend court
- Commit another offence
- Interfere with witnesses
- Obstruct the investigation
- Place another person at risk
Bail conditions may be imposed to manage an identified risk. Someone refused police bail will normally be brought before a magistrates’ court as soon as reasonably practicable.
Breaching bail conditions can make release more difficult and may result in the person being arrested again.
What Happens at the First Court Hearing?
A knife-possession case will normally begin in a magistrates’ court. At the first hearing, the court may:
- Confirm the defendant’s identity
- Explain or confirm the charge
- Address legal representation
- Consider bail
- Ask for an indication of plea
- Decide how the case should proceed
- Set future hearing dates
Possessing a bladed article or offensive weapon in a public place is generally an either-way offence. Depending on the circumstances and procedural decisions, the case may remain in the magistrates’ court or proceed to the Crown Court.
The first hearing is not normally the full trial. Defendants should not assume that all witnesses will attend or that every item of evidence will be examined immediately.
What Must the Prosecution Prove?
The precise elements depend on the offence charged. In a typical public-place bladed-article case, important questions may include:
- Was the location legally considered a public place?
- Did the article have a blade or sharp point?
- Did the defendant have the article with them?
- Did the defendant know about the article?
- Did the defendant control it?
- Does the folding-pocketknife exception apply?
- Did the defendant have good reason or lawful authority?
- Was the search carried out lawfully?
- Are the prosecution witnesses reliable?
- Was the police interview conducted fairly?
- Has relevant evidence been properly disclosed?
The prosecution must prove the elements of the offence beyond reasonable doubt. However, a defendant relying on good reason or lawful authority generally has the burden of establishing that defence on the balance of probabilities.
What Are the Possible Sentences for Knife Possession?
Possessing a bladed article or offensive weapon in a public place can carry a maximum sentence of four years’ custody. The maximum sentence does not mean that everyone convicted will receive four years in prison.
Courts apply the relevant sentencing guideline and consider factors such as:
- The nature of the weapon
- Whether it was readily available for use
- The reason it was carried
- The location and surrounding circumstances
- Whether the incident involved planning
- The risk of harm
- Previous relevant convictions
- The defendant’s age and maturity
- Personal mitigation
- Whether and when a guilty plea was entered
Depending on the circumstances, the sentence can range from a fine or community order to immediate imprisonment.
Previous relevant convictions can significantly affect the result. An adult convicted of a second or further relevant weapon offence may face a statutory minimum custodial sentence of six months unless the court concludes that imposing it would be unjust in all the circumstances.
Different minimum-sentencing provisions apply to children and young people. The Sentencing Council’s guidance on knives and offensive weapons provides additional information about the sentencing framework.
Can a Knife-Possession Charge Be Defended?
A charge may be challenged when the prosecution cannot prove every required element or when a recognised defence applies.
Potential issues may include:
- The defendant did not know the knife was present
- Another person possessed or controlled the item
- The article did not fall within the alleged legal category
- The location was not legally a public place
- The article qualified for a statutory exception
- The defendant had good reason or lawful authority
- The search or seizure was unlawful
- Police accounts were inconsistent
- CCTV contradicted the prosecution’s version
- The interview was conducted unfairly
- Relevant evidence was not disclosed
- The prosecution could not prove possession beyond reasonable doubt
A defence must be based on the evidence and applicable law. Deleting messages, altering documents or asking witnesses to change their accounts can create serious additional problems.
What Should You Do After Being Released?
Someone released after an arrest should retain all documents provided by the police and comply carefully with every bail condition.
Practical steps may include:
- Write down what happened while the events remain fresh
- Preserve relevant messages and photographs
- Keep receipts, work records and travel documents
- Identify potential witnesses
- Avoid posting about the allegation on social media
- Do not contact witnesses when prohibited
- Attend every police-station and court appointment
- Inform a solicitor about employment or immigration concerns
- Preserve all potentially relevant evidence in its original form
The defendant should not manufacture, alter, conceal or destroy anything connected to the case.
Can a Knife-Possession Case Affect Employment or Immigration Status?
A conviction can potentially create consequences beyond the sentence imposed by the court. Depending on the person’s circumstances, it may affect:
- Employment
- Professional licences
- University applications
- Immigration status
- International travel
- Housing opportunities
- Disclosure and background checks
An arrest without conviction is different from a conviction, but information may still be recorded or disclosed in certain circumstances. Anyone concerned about employment, professional or immigration consequences should obtain advice addressing those specific issues.
Frequently Asked Questions
What happens after you are arrested for knife possession in London?
You will usually be taken to a police station, booked into custody, informed of your rights and potentially interviewed under caution. Police may release you without further action, release you under investigation, grant pre-charge bail or formally charge you.
Can you go to prison for carrying a knife in London?
Yes. Possessing a bladed article or offensive weapon in a public place can result in imprisonment. The sentence depends on the circumstances, seriousness of the offence, previous convictions and applicable sentencing rules.
Is it legal to carry a pocketknife in London?
A limited exception applies to certain folding pocketknives with a cutting edge not exceeding three inches. Lock knives do not generally fall within that exception. An otherwise lawful item may still be illegal when it is carried as a weapon.
Can you carry a knife for self-defence?
Carrying a knife for personal protection is not generally treated as a lawful reason. Intending to use an article to injure someone may support an allegation that it was being carried as an offensive weapon.
Is carrying a knife for work a defence?
Carrying a knife for use at work may amount to a good reason. However, the person may need evidence connecting the knife to genuine work and explaining why it was being transported at that particular time and place.
Do you need a solicitor during the police interview?
A person in police custody has the right to request free and independent legal advice. A solicitor can assess the allegation, advise how to respond and attend the interview. Requesting a solicitor does not imply guilt.
How long can police hold you for knife possession?
Police can normally detain someone for up to 24 hours before charging or releasing them. Detention may be extended in certain serious cases when the required legal authorisation is obtained.
Can you be charged when the knife belonged to someone else?
Yes, potentially. Ownership and possession are not necessarily the same. The prosecution may argue that someone knowingly possessed or controlled a knife even when another person legally owned it.
Will the arrest appear on a criminal record?
An arrest is different from a conviction. Whether information about an arrest, charge or conviction may be recorded or disclosed depends on the outcome, the type of record check and the relevant disclosure rules.
Does every knife-possession conviction lead to prison?
No. The sentence depends on the seriousness of the case, the defendant’s record, the nature of the weapon and other aggravating or mitigating factors. Repeat relevant offences can trigger minimum-sentencing provisions.
Understanding What Happens Next
What happens after you are arrested for knife possession in London depends on more than the discovery of a knife. The type of article, location, police search, suspect’s knowledge, explanation for carrying it, interview answers and previous convictions can all affect the outcome.
The case may end without a charge, remain under investigation or proceed through the magistrates’ court and potentially the Crown Court. Statements made during the initial police interview can become important evidence, which is why obtaining legal advice at the police station may be particularly valuable.
Legal Note: This article provides general educational information and is not legal advice. It discusses the law of England and Wales as understood at the time of publication. Knife laws, police procedures, charging standards and sentencing rules can change, while every case depends on its particular facts. Anyone arrested, charged or investigated for a knife-related offence should obtain advice from a qualified criminal defence solicitor in England and Wales.