The Protected Witness in Criminal Proceedings in Spain (2026)
In this article
Key Takeaways
- Governed by Organic Law 19/1994
- Measures: concealed identity, non-visible testimony
- The defence may request the identity
- A protected witness alone cannot convict
A protected witness is one covered by Organic Law 19/1994 on the protection of witnesses and experts in criminal cases with measures adopted where there is a serious danger to their person, liberty or property, or that of their relatives: concealing their identity data, testifying with a concealed identity or through a code, and appearing while avoiding visual identification (screen, video link or image and voice distortion). These measures create tension with the right of defence, so the law allows the defence to request the witness's identity before trial in order to challenge them. A conviction cannot rest solely on an anonymous testimony that could not be subjected to challenge.
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The figure of the protected witness seeks a difficult balance: protecting the person who testifies from reprisals without sacrificing the defendant's right of defence. As criminal lawyers, we explain how it works.
What a Protected Witness Is
Organic Law 19/1994 on the protection of witnesses and experts in criminal cases allows protection measures to be adopted where there is a serious danger to the person, liberty or property of the witness or their relatives. It is common in drug-trafficking, organised-crime or violence cases.
The Protection Measures
- That their identity data does not appear in the proceedings.
- That they appear with their identity concealed or using a code.
- Testifying while avoiding visual identification: screen, video link or image and voice distortion.
- Police protection and, in extreme cases, a change of identity.
The Tension With the Right of Defence
The witness's anonymity hampers the defence: it prevents checking whether they have enmity, an interest or reasons to lie. The law therefore allows the defence to request the identity of the protected witness before trial, in order to challenge them effectively.
⚠️ An evidential limit
A conviction cannot rest solely on the testimony of a protected witness whose credibility could not be subjected to challenge. The defence must demand that possibility.
How It Is Countered
The defence can challenge the measures where they are unjustified, request the witness's identity, question them thoroughly on credibility and highlight the absence of corroborating evidence. The presumption of innocence requires solid evidence, not a single anonymous testimony.
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Frequently asked questions
What is a protected witness?
A protected witness is a witness or expert covered by Organic Law 19/1994 with protection measures where there is a serious danger to their person, liberty or property, or that of their relatives. It is common in drug-trafficking, organised-crime or violence cases.
What protection measures does the law allow?
That their identity data does not appear in the proceedings, that they appear with a concealed identity or using a code, that they testify while avoiding visual identification (screen, video link or image and voice distortion) and, in extreme cases, police protection or a change of identity.
Can the defence find out the identity of the protected witness?
Yes. Anonymity makes it hard to check whether the witness has enmity, an interest or reasons to lie, so the law allows the defence to request their identity before trial, in order to challenge them effectively.
Can a conviction rest solely on the testimony of a protected witness?
No. A conviction cannot rest solely on the testimony of a protected witness whose credibility could not be subjected to challenge. The presumption of innocence requires solid evidence, not a single anonymous testimony.
How is the testimony of a protected witness countered?
The defence can challenge the measures where they are unjustified, request the witness's identity, question them thoroughly on credibility and highlight the absence of corroborating evidence.
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