Response, arrest and detention
Detention and Custody — Authorised Professional Practice
Summary
This section outlines the considerations required when making the decision to arrest and highlights the necessity for ongoing risk assessment at all stages of detention and custody. It includes guidelines on assessing vulnerability, handling violent and vulnerable detainees, ensuring fitness for detention, determining when a detainee cannot be detained, and managing pre-charge bail. The information stresses the importance of individual circumstances in decision-making processes and encompasses legal obligations as per the Police and Criminal Evidence Act (PACE). Officers must prioritize safety in all interactions, ensure timely medical treatment when necessary, and maintain rigorous documentation throughout the detention process.
Key principles
- 1Conduct immediate risk assessments for all incidents.
- 2Ensure lawful arrest based on reasonable grounds.
- 3Prioritize the welfare and safety of detainees and others.
- 4Use pre-charge bail methods appropriately and proportionately.
- 5Document all relevant actions and decisions regarding detainees.
Defined terms
- National Decision Model (NDM)
- A guide for decision making focusing on information, legal powers, and options.
- Police and Criminal Evidence Act 1984 (PACE)
- Legislation governing police powers and detention processes.
- Section 136 of the Mental Health Act 1983
- Provision allowing police to take a person to a place of safety for assessment.
- Public Health Act 1984
- Legislation that enables police to deal with public health emergencies.
This is a brief, factual summary. The full APP guidance — including operational detail, statutory references and case studies — lives on the College of Policing website. APP is the authoritative source for UK policing practice.
Read the full APP guidanceSource: College of Policing — Authorised Professional Practice · Crown copyright, licensed under Open Government Licence v3.0. Summary fetched 2026-06-27.