Sources and Classification of Law

TL;DR

Understanding the sources and classification of law is crucial for policing because it dictates the rules you enforce and the legal framework you operate within. Law primarily comes from statutes, common law, and constitutional law, each with distinct origins and applications. Classifying law into criminal/civil or public/private helps define jurisdiction, procedures, and potential penalties.

1. The Mental Model

Think of law as a set of instructions. These instructions come from different "recipe books" (sources), and they're organised into different "sections" (classifications) based on what they're trying to achieve and who they apply to.

2. The Core Material

As a police officer, you'll constantly interact with the law. Knowing where laws come from and how they're categorised isn't just academic; it's fundamental to your daily duties, from making arrests to gathering evidence and ensuring due process.

Sources of Law

Photo by Nothing Ahead on Pexels

Laws don't just appear out of thin air. They originate from specific authorities and processes.

a. Constitutional Law

This is the supreme law of the land. In the UK, it's not a single codified document but a combination of statutes, common law, and conventions. It establishes the structure of government, defines powers, and protects fundamental rights. For policing, this means understanding things like human rights (e.g., the Human Rights Act 1998 incorporating the European Convention on Human Rights) which directly impact arrest, detention, and search powers.

b. Statutory Law (Acts of Parliament)

These are laws created and passed by Parliament. They are formally written, debated, and enacted, forming the bulk of modern law. Examples relevant to policing include the Police and Criminal Evidence Act 1984 (PACE), the Misuse of Drugs Act 1971, and the Public Order Act 1986. These Acts define offences, powers of arrest, search, and seizure, and dictate procedures.

c. Common Law (Case Law / Precedent)

Common law is developed by judges through their decisions in court cases. When a judge makes a ruling, it sets a precedent for future cases with similar facts. This principle is called stare decisis (to stand by things decided). While many offences are now statutory, common law still defines some crimes (e.g., murder, common assault until partially codified) and establishes general principles of law and evidence.

d. Delegated Legislation

This is law made by government ministers, local authorities, or other bodies under powers granted to them by an Act of Parliament. Examples include Statutory Instruments, By-laws, and Orders in Council. These often provide detailed rules necessary to implement broader statutory provisions (e.g., speed limits set by local authorities under road traffic acts).

Classification of Law

Photo by Christian Wasserfallen on Pexels

Laws can be categorised in several ways, which helps determine their purpose, who they affect, and the procedures involved.

graph TD
    A["Law"] --> B["Criminal Law"]
    A --> C["Civil Law"]

    B --> B1["Public Law"]
    B1 --> B1a["Constitutional Law"]
    B1 --> B1b["Administrative Law"]
    B1 --> B1c["Criminal Law (as a public interest)"]

    C --> C1["Private Law"]
    C1 --> C1a["Contract Law"]
    C1a --> C1a1["Breach of Contract"]
    C1 --> C1b["Tort Law"]
    C1b --> C1b1["Negligence"]
    C1b --> C1b2["Defamation"]
    C1 --> C1c["Family Law"]
    C1 --> C1d["Property Law"]

    SubGraph[Classification of Law]
        B1 --- B["(Crimes against the state/society)"]
        C1 --- C["(Disputes between individuals/organisations)"]
    End

a. Criminal Law vs. Civil Law

• Criminal Law: Deals with conduct that is considered harmful to society as a whole. The state (the Crown Prosecution Service in England and Wales) brings charges against an individual. The aim is punishment (e.g., imprisonment, fines) and deterrence. You, as a police officer, primarily deal with criminal law.
  • Examples: Theft, assault, fraud, murder.
• Civil Law: Deals with disputes between individuals or organisations. The aim is to resolve the dispute, often through compensation (damages) or injunctions.
  • Examples: Contract disputes, personal injury claims (tort), divorce, landlord-tenant issues. While police aren't usually involved in enforcing civil matters directly, you might encounter situations with both criminal and civil elements (e.g., an assault leading to criminal charges and a civil claim for damages).

b. Public Law vs. Private Law

• Public Law: Governs the relationship between individuals and the state. It includes:
  • Constitutional Law: As discussed, outlines the framework of government.
  • Administrative Law: Governs the activities of administrative agencies of government. It deals with decision-making powers of public bodies (e.g., police complaints).
  • Criminal Law: Is also considered public law because offences are against the state, not just an individual.
• Private Law: Governs the relationships between individuals, organisations, or groups. It's essentially another way to describe civil law.
  • Examples: Contract law, tort law (e.g., negligence), property law, family law.

3. Worked Example

Imagine you respond to a report of a domestic disturbance. When you arrive, a person states their partner has physically assaulted them. The partner denies it, claiming they were just arguing about unpaid rent.

1. Identify the Criminal Element: The accusation of physical assault immediately brings it under criminal law. Specifically, it's likely an offence under the Offences Against the Person Act 1861 (a statutory law) or a common law assault. Your duties here fall under public law, enforcing the state's interest in preventing violence. You have powers of arrest and investigation under PACE.
2. Identify the Civil Element: The mention of "unpaid rent" points to a civil law matter, specifically a contract law or property law dispute between the individuals. This falls under private law. As a police officer, you wouldn't typically intervene to resolve a rent dispute directly, but you might advise them on seeking legal counsel for that specific issue after addressing the criminal aspects.
3. Potential Constitutional Overlap: If you make an arrest, you must ensure you respect the suspect's rights (e.g., right to liberty, right to silence) as protected by constitutional law (e.g., Article 5 and 6 of the Human Rights Act).

4. Key Takeaways

• Laws are derived from multiple authoritative sources: constitutions, statutes, common law, and delegated legislation.
• Constitutional law is the supreme law, influencing all other legal frameworks, including policing powers.
• Statutory law (Acts of Parliament) forms the largest body of law you'll enforce, defining specific offences and procedures.
• Common law is judge-made law, setting precedents that guide future legal decisions.
• Criminal law deals with offences against the state, leading to punishment, and is your primary focus.
• Civil law resolves disputes between individuals, often through compensation, and is usually outside direct police enforcement.
• Public law governs state-individual relationships, while private law governs individual-individual relationships.
• Understanding these classifications helps define jurisdiction, procedures, and your role in different situations.

5. Now Try It

Think about a specific police interaction you might have, like dealing with a shoplifter. Identify at least one source of law that defines shoplifting as a crime and one that governs your powers to deal with the suspect (e.g., arrest, search). Then, consider how this scenario fits into the criminal/civil and public/private law classifications. What would success look like in identifying these? You should be able to name the specific Act (or type of law) and clearly state why it's criminal/public.