This guide is maintained as a current resource for September 2026 and covers only the laws of England and Wales. Information is for general guidance, not legal advice. Consult a qualified solicitor for advice specific to your situation.
Discover what bad character evidence means in criminal trials in England and Wales, how the Criminal Justice Act 2003 defines and governs its use, the statutory gateways for admissibility, and key practical considerations in introducing or challenging such evidence.
Bad character evidence is a legal term used in criminal proceedings in England and Wales to describe evidence about a person's past behaviour that does not directly relate to the facts of the offence currently being tried but which may suggest a disposition towards misconduct. It is primarily introduced to help the court make sense of contested issues, such as propensity to commit a kind of offence or credibility. This article explains how bad character evidence works under UK law, when it can be used, the rules governing its admissibility, and practical considerations within criminal justice.
Modern statutory law governing bad character evidence is largely found in the Criminal Justice Act 2003 (CJA 2003), which replaced most of the old common‑law rules about such evidence.
What the Law Means by “Bad Character Evidence”
Under the Criminal Justice Act 2003, bad character evidence is defined as evidence of, or a person's disposition towards misconduct - including prior convictions, cautions, allegations and other conduct - that is separate from the facts of the current offence being tried and not part of the investigation or prosecution of that offence.
“Misconduct” in this context includes the commission of an offence or other behaviour that a court would view as reprehensible. It covers not only formal convictions but also conduct that reflects a tendency towards wrongdoing, albeit not resulting in a previous conviction.
Examples may include:
- Previous convictions for similar offences.
- A history of relevant alleged misconduct or pattern of behaviour not charged at the time.
- Evidence suggesting a propensity to lie or act violently.
However, evidence that has to do with the facts of the offence charged or evidence arising from the investigation or prosecution of that same offence is not treated as bad character evidence for these purposes, since it is already before the court as part of the prosecution's case.
Why Bad Character Evidence Is Regulated
Bad character evidence is potentially highly prejudicial. If a jury or magistrates know that a defendant has a criminal past or a disposition to misbehave, they may be more likely to convict based on character rather than on the evidence relating to the alleged offence. This runs counter to fundamental principles of fairness and the presumption of innocence.
To balance the need for fairness with the practical utility of such evidence, Parliament enacted a statutory framework under the CJA 2003 that firmly regulates when bad character evidence may be admitted. Common‑law exclusions were abolished and replaced with a structured regime designed to ensure evidence is admissible only when it is sufficiently relevant and fair to do so.
The Statutory Gateways for Admitting Bad Character Evidence
Under section 101(1) of the Criminal Justice Act 2003, evidence of a defendant's bad character can only be admitted into criminal proceedings if it passes through one or more of the recognised “gateways”. These gateways act as legal filters to help ensure that evidence is admissible only when appropriate and materially relevant.
The seven most commonly recognised gateways are:
- Agreement – All parties agree the bad character evidence should be admitted.
- Self‑admission – The defendant introduces the evidence themself or answers a question intended to elicit it in cross‑examination.
- Important explanatory evidence – The evidence helps explain other evidence so the court can understand the case properly.
- Relevance to an issue in dispute – The evidence is relevant to an important matter in issue between the defendant and the prosecution (for example, propensity to commit similar offences or to be untruthful).
- Co‑defendant relevance – It has substantial probative value on an important matter in issue between co‑defendants.
- Correcting a false impression – It is used to correct a misleading impression given by the defendant.
- Attack on another person's character – The defendant has attacked someone else's character, permitting the prosecution to respond with evidence of the defendant's bad character.
The court must carefully evaluate whether a gateway applies, and in certain situations must refuse to admit the evidence if it would have an adverse effect on the fairness of the proceedings.
Bad Character of Non‑Defendants
Bad character evidence about non‑defendant persons (for example, witnesses, victims or others mentioned in evidence) is governed by section 100 of the CJA 2003. Such evidence may be admitted only if:
- It is important explanatory evidence without which the court would struggle to understand other evidence.
- It has substantial probative value on a matter that is in issue and of substantial importance in the context of the case.
- All parties agree it should be admitted.
This stricter approach reflects the inherent prejudice in admitting another person's misconduct unless it is truly necessary to understand the issues before the court.
Practical Examples
Prior Convictions and Trends
If a defendant charged with burglary has previous convictions for multiple similar offences, the prosecution might seek to admit that information to show a propensity to commit similar crimes. Whether such evidence is admitted will depend on whether it falls under one of the gateways, such as relevance to an important matter in issue.
Cross‑Examination on Character
If a defendant suggests during interview or in court that they have always been an honest person, and this is a key part of their defence, the prosecution may apply to introduce bad character evidence to correct that impression.
Non‑Conviction Behaviour
Evidence of a pattern of reckless driving or verbal aggression not resulting in conviction might be tendered under the explanatory gateway if it helps place other evidence in context. Each case must be assessed on its individual facts and relevance.
Procedural Rights and Obligations
Before bad character evidence can be tendered, the prosecution or defence must normally give notice to the court and the opposing party, specifying the nature of the evidence and the grounds for its admissibility. Courts may also consider whether the evidence is so prejudicial that it should be excluded to preserve the fairness of the trial.
Prosecutors and defence representatives must carefully consider disclosure obligations, as bad character material that could assist the defence in challenging a witness's credibility - including prior convictions - may need to be disclosed under broader disclosure duties.
Key Considerations and Risks
Fairness and Prejudice
Even where a gateway exists, the court can exclude bad character evidence if admitting it would undermine the fairness of proceedings, for example if it gives an unfair impression on an issue unrelated to the central dispute.
Impact on Jury Perceptions
Because bad character evidence can influence jurors by suggesting a defendant is likely to behave in a certain way, judges must carefully manage how such evidence is presented and ensure juries are properly directed on its limited use. This is especially important where the evidence relates to pattern or propensity rather than direct proof of the charged offence.
Defence Strategy
Defence practitioners must be alert to applications by the prosecution and may challenge admissibility or argue that the prejudicial effect outweighs any probative value. Defendants may also open the door to such evidence by their own conduct or statements.
Key Takeaways
Bad character evidence is evidence of or showing a person's propensity towards misconduct that does not directly relate to the offence charged. It is governed by a statutory framework under the Criminal Justice Act 2003, which sets out specific gateways through which such evidence may be introduced into criminal proceedings and provisions under which it may be excluded to preserve the fairness of a trial. This evidence can include prior convictions, cautions, other conduct, or allegations and is often used to challenge credibility or illustrate patterns of behaviour. Courts and legal practitioners must approach bad character evidence with rigour, ensuring that it is relevant, fairly admitted and carefully weighed to avoid prejudice.
