The Pritchard Test: How to Stop an Unfit Interview at the Custody Desk

Every busy custody suite has a mental-health professional. They will see your client. They will decide whether your client is “fit to be detained” and “fit to be interviewed”. If they say fit, the interview is expected to go ahead.

That is not enough.

A mental-health practitioner at the police station is checking whether your client is at acute risk in the cell and whether there is a recognised psychiatric condition that prevents the interview. They are not checking whether your client can follow the caution, understand the offence, weigh the jeopardy of the situation, or participate in their own defence.

That is your job. And there is a test for it.

R V Pritchard 1836

The Pritchard test is the long-standing common-law standard for fitness to plead. It was articulated by Baron Alderson at Maidstone Assizes in R v Pritchard (1836) 7 C&P 303 and has been the working test for the Crown Court ever since (refined in R v M (John) [2003] EWCA Crim 3452 and now sitting alongside the Criminal Procedure (Insanity) Act 1964 procedure).

The four classic limbs are whether the defendant can:

• understand the charge
• understand the difference between guilty and not guilty
• challenge a juror
• instruct counsel and follow the trial

It was designed for trial, not for the custody suite. But the underlying principle, the accused must be able to participate, not merely be present, is the principle that applies at the police station. And that is how a working PSR uses it.

Adapting Pritchard to the Interview Room

Experienced PSRs treat fitness to be interviewed as a four-question test. Before deciding to allow the interview to proceed, ask whether your client can:

1. Understand the caution. Not just hear it, understand that silence may be held against them, and that anything they say is evidence.
2. Understand the offence. Not just hear the word “assault” or “rape”, understand what the police are accusing them of doing.
3. Understand the jeopardy. The possible consequence, court, prison, the criminal record, and that the interview shapes it.
4. Understand the court process. That an interview is not a conversation. It is evidence.

If your client fails on any one of these, they are not fit to be interviewed. The Code C protections you rely on assume a participating client. If your client is not participating, those protections collapse, and any account obtained will be challenged on admissibility under s.78 PACE 1984 (see Code C 11.18 and Code C Annex G).

The Routine, What to Actually Say

When you reach this view, do not raise it with the interviewing officers. They are not the gatekeeper. They have an interview plan in front of them and a clock to beat.

Ask to speak to the custody sergeant.

Stand in front of the custody desk. Say, as close to verbatim as you can manage:

“I am informing you my client fails the Pritchard test. We cannot proceed to interview. They do not understand the caution. They do not understand the offence. They do not understand the jeopardy they are in. They do not understand the court proceedings. There is no purpose in interviewing them, and any interview will not be admissible.”

Then stop talking.

The custody sergeant is responsible for the integrity of the detention and is required to record matters affecting the suspect’s welfare and capacity (Code C 2.4 and Code C 3.5). They are also acutely aware that an inadmissible interview is a loss, not a gain, for the case file.

In practice, when a PSR invokes the Pritchard test cleanly at the custody desk, the result is typically the same: the police decline to interview.

Why It Works

Police officers know an inadmissible interview is worse than no interview. Once the words “PSR informed custody sergeant the client failed the Pritchard test” appear on the custody record, the interview becomes legally radioactive. Any account obtained is open to challenge at trial, a defence advocate can ask the officer in the witness box why they proceeded after being told.

There is an anchor case that captures this. A client was clearly unable to engage. The custody sergeant was put on notice. The officers proceeded anyway. In the interview room the client made noises, unplugged the recording machine, and spat on the microphone. The interview was abandoned. The officers came back to the sergeant and said: “we can’t interview him.” The PSR replied: “I told you.”

The client did not need to be psychotic. The point was that the officers had been told, on the record, that the threshold was not met. Their decision to proceed was their decision to expose the file.

At the Station

At the station: If you cannot get instructions in consultation, do not negotiate with the interviewing officers. Ask to be taken to the custody sergeant. State the four limbs verbatim. Ask explicitly for the refusal and your representation to be recorded on the custody record. Do not leave the desk until the sergeant has read the entry back to you.

When to Lean on It

• The client cannot follow your explanation of the caution after two attempts.
• The client cannot tell you, in any form, what the police say they did.
• The client cannot answer the question “if you get charged, what happens next?”
• The client’s account drifts entirely off-topic when you ask about the offence.
• The mental-health professional has cleared the client but you sit down and cannot get instructions.

The last one is the one that catches people. The mental-health gate is not your gate. The Pritchard test is.

What This Is Not

The Pritchard test is not a tool for buying time. It is not a tool for shielding a client whose case is weak. It is a tool for those moments where you are sitting opposite a person who cannot tell you what happened, because they are too unwell, too intoxicated, too cognitively impaired, or too far outside the legal frame to understand what is being asked of them.

If you cannot take instructions, you cannot represent. If you cannot represent, you should not be in the interview room.

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