R v Turnbull [1977] QB 224
R v Turnbull establishes safeguards for criminal cases depending on disputed visual identification. Judges must warn juries about the special risk of honest but mistaken identification and assess the evidence's quality.
Facts
The Court of Appeal considered several joined appeals in which convictions depended wholly or substantially on identification evidence disputed by the accused. The cases exposed recurring dangers: a confident witness may be mistaken, recognition of someone previously known can still be wrong, and weak viewing conditions may make cross-examination an inadequate safeguard. The court gave general guidance for trial judges rather than resolving a new substantive offence. It addressed when a case may be left to the jury, what warning is required, which circumstances affect the quality of identification, and when supporting evidence is needed before a conviction can safely rest on a witness's visual identification.
Legal Issue
What directions and safeguards are required where the prosecution case depends wholly or substantially on visual identification that the defendant says is mistaken?
Held
Lord Widgery CJ set out mandatory guidance. The judge should warn the jury of the special need for caution before convicting on disputed identification and explain why: an honest witness can be convincing yet mistaken, and several witnesses can all be wrong. The jury should examine closely the circumstances of observation, including duration, distance, lighting, obstruction, prior familiarity, time before identification and discrepancies in the witness's first description. Where the quality is good, the evidence may be left to the jury with the warning. Where it is poor, the judge should withdraw the case unless other evidence supports the identification. The judge must identify any such supporting evidence accurately and remind the jury that recognition can also be mistaken.
⭐ Legal Principle
Where disputed visual identification is wholly or substantially the basis of the prosecution case, the judge must give a clear caution about honest mistake and direct the jury to examine the quality of the observation. Poor identification unsupported by other evidence should not be left to found a conviction.
Significance
Turnbull remains the foundation of judicial directions on visual identification and helps protect against miscarriages of justice. The familiar mnemonic ADVOKATE can assist students in recalling relevant viewing factors, but it is not itself the legal authority or a substitute for the judgment's guidance. The rules principally concern identification of a person by a witness; different evidence, such as properly proved DNA or automatic recognition technology, raises its own reliability and admissibility questions. Breach of the guidance does not mechanically determine an appeal, but the court will examine whether the conviction is safe.
Common exam questions about this case
Why is a Turnbull warning required even where the witness appears honest and confident?
The principal danger is mistake, not dishonesty. A sincere witness may be persuasive and certain yet wrong, and confidence does not reliably prove accuracy. The jury must therefore be told of the special need for caution and directed to test the conditions in which the observation and later identification were made rather than relying on demeanour alone.
What should happen where the identification evidence is of poor quality?
The judge should consider whether other evidence supports the identification. If the quality is poor and there is no supporting evidence capable of strengthening it, the case should be withdrawn from the jury. If support exists, the judge must identify it carefully and avoid treating evidence that merely repeats or depends upon the original identification as independent confirmation.
Does recognition of someone previously known remove the risk of identification error?
No. Prior familiarity may improve the quality of the evidence, but Turnbull expressly recognises that mistakes can occur even when a witness claims to recognise someone. The jury should consider how well and in what circumstances the witness knew the accused, along with the opportunity to observe and any inconsistencies in the identification.