‘Do You Understand?’ Is Not a Comprehension Test

“Do you understand?” sounds like a check. In practice it usually tests only whether the person is willing to say yes.

That matters in policing because the question appears at high-consequence moments: after a caution, during booking-in, when rights are explained, before an interview, and when bail or other conditions are imposed. Two of those moments have their own articles on this site: why detainees so often decline the free legal advice they are entitled to, and why making sense of what happened sometimes requires active help long after the event.

A person who says “yes” may understand perfectly. They may also have understood only part of the explanation, misunderstood a legal term or simply want the interaction to move on. The closed question does not tell the officer which is true.

The legal framework already recognises that understanding sometimes needs active support. PACE Code C says an appropriate adult should help juveniles and vulnerable people understand their rights and assist them to communicate with the police. PACE Code C, paragraph 1.7A.

The operational question is therefore not whether officers should explain things. It is how they know the explanation worked.

Understanding should be something the process checks, not something the person is invited to perform.

A yes/no answer contains very little information

Suppose an officer explains a bail condition and asks, “Do you understand?”

“Yes” produces a clean administrative result. It does not reveal whether the person thinks the prohibited address is the whole road or one property, whether they understand the time limit, or whether they know what will happen if they breach it.

A more informative question is:

“Tell me in your own words what this condition means for you tonight.”

The answer immediately exposes the gap if one exists.

This is the practical advantage of an explain-back or teach-back approach. It does not require the officer to diagnose why comprehension is difficult. It simply checks whether the message that matters has landed accurately.

PACE already treats communication as part of safeguarding

The current PACE Code C applies to detention, treatment and questioning of non-terrorism suspects in police custody in England and Wales. Its definition of the appropriate adult role is active, not ceremonial.

The appropriate adult is expected to support, advise and assist the person, observe whether police are acting properly and fairly, assist communication and help the person understand their rights. PACE Code C.

Code C also recognises that information may need to be provided later where a person is temporarily incapable of understanding it, for example because of urgent medical need or another immediate condition. The framework therefore does not assume that saying words in the person’s presence is equivalent to communicating them successfully.

That principle applies more widely than formal appropriate-adult cases. A person can struggle with legal language because of stress, intoxication, language barriers, learning disability, neurodivergence, mental ill health, hearing or speech difficulties, or simply because the explanation was poor. The cause matters when deciding what support is required. It is not necessary to know the cause before noticing that the person cannot explain the information accurately.

Courts use the same underlying principle

The Equal Treatment Bench Book, updated in February 2026, exists to help courts and tribunals communicate effectively and support participation by people with different needs and circumstances. Judicial College.

The current Criminal Procedure Rules and Criminal Practice Directions likewise contain provisions concerned with defendants’ effective participation and mechanisms for communication assistance. The GOV.UK consolidated page was updated in April 2026. Criminal Procedure Rules 2025 and Criminal Practice Directions 2023.

The important point is not that police custody and criminal courts use identical procedures. They do not. It is that the justice system already accepts a basic proposition: participation requires more than physical presence.

Explain-back is a check, not an examination

A comprehension check can easily become patronising if it is framed as a test of intelligence.

The officer’s wording should make clear that the purpose is to check the explanation, not catch the person out.

Useful formulations include:

• “Just so I know I’ve explained it clearly, tell me what you understand this condition to mean.”
• “What do you think your choices are after the caution I’ve just given you?”
• “What address are you not allowed to go to?”
• “What happens next, as you understand it?”

If the answer is wrong, the next step is not to repeat exactly the same words more loudly. Rephrase. Break the information into smaller parts. Check whether an interpreter, appropriate adult, legal adviser or other adjustment is needed.

The technique is particularly useful where misunderstanding has a foreseeable consequence: an interview decision, consent, a condition capable of breach, a court date or a safeguarding instruction.

Forces should distinguish explanation from verification

Many operational forms collapse the two into one field: “rights explained and understood”.

Those are different claims.

The officer can know whether the rights were explained. Understanding belongs to the other person and needs evidence if it is going to be recorded confidently.

Forces do not need lengthy comprehension assessments for every routine interaction. They do need a clearer standard at points where a misunderstanding can affect evidence, liberty, safeguarding or later enforcement.

A practical local policy would specify:

1. the high-consequence points at which comprehension should be checked rather than assumed;
2. a short explain-back prompt;
3. an escalation route where the answer shows misunderstanding;
4. how the result should be recorded without turning the process into another tick-box ritual.

The change is small because the legal principle already exists

PACE does not require officers to use the phrase “teach-back”. Judicial guidance does not turn every explanation into an oral examination.

The recommendation is narrower: where understanding matters, use a question capable of revealing misunderstanding.

“Do you understand?” often cannot do that. An explanation in the person’s own words can.

That makes the process more defensible, particularly for the people most likely to nod through formal language they have not fully understood. It also gives officers something useful: an immediate indication of exactly what needs explaining again.

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Sources and further reading

• PACE Code C 2023
• Judicial College — Equal Treatment Bench Book, February 2026 update
• Criminal Procedure Rules 2025 and Criminal Practice Directions 2023