What Is the Full Code Test for Charging Drug Offences?

When someone is suspected of committing a drug offence in England and Wales, prosecutors must decide whether to formally charge them with a criminal offence. Before any charge can proceed to court, that case must be assessed against a structured legal framework known as the Full Code Test. This test is set out in the official Code for Crown Prosecutors and ensures that only cases with sufficient evidence and appropriate public interest justification proceed to prosecution.

Drug offences cover a wide range of conduct under the Misuse of Drugs Act 1971, from simple possession and production to supply, importation and more complex organised activity. Because the legal and evidential issues in drug cases can be complicated, the charging process must be robust, transparent and fair.

This article explains what the Full Code Test is, how it operates in drug cases, and what it means for suspects, victims and the wider criminal justice system in a clear and accessible way.

Understanding Drug Offences in England and Wales

Under the Misuse of Drugs Act 1971, drug‑related criminal offences include:

• Possession of controlled drugs without lawful authority;
• Possession with intent to supply;
• Supplying or offering to supply controlled drugs;
• Production of controlled drugs;
• Importation or exportation of controlled drugs.

Controlled drugs are grouped into classes (A, B and C) based on potential harm, with Class A offences typically treated as most serious. Prosecutors and police must identify the correct legal offence based on the conduct and evidence before them.

What Is the Full Code Test?

The Full Code Test is a two‑stage legal assessment that prosecutors must apply when deciding whether to charge a suspect with a criminal offence, including drug offences. It consists of:

1. The Evidential Stage; and
2. The Public Interest Stage.

Both stages must be satisfied before a prosecution can be authorised under this test.

Applicability

The Full Code Test applies when all reasonable lines of enquiry have been pursued or where further evidence is unlikely to alter the decision. It is the standard approach for charging decisions and is distinguished from the Threshold Test, which is only used in limited circumstances where there is urgency in charging before all evidence has been gathered.

1. The Evidential Stage: Sufficient Evidence for Conviction

At the first stage, a prosecutor must assess whether there is enough evidence to provide a realistic prospect of conviction against the suspect for the alleged offence. This is an objective assessment based on the evidence available at the time, including any defence the suspect may raise.

**What “Realistic Prospect of Conviction” Means

A realistic prospect of conviction means that an impartial jury or bench of magistrates, properly directed and acting according to the law, is more likely than not to convict the suspect on the evidence. Keep in mind that this is a lower threshold than the criminal court's requirement to prove guilt beyond reasonable doubt.

**Evidential Considerations in Drug Cases

In drug offence cases, prosecutors consider evidence such as:

• Forensic analysis of seized substances to confirm controlled drug status;
• Witness statements from law enforcement or other witnesses;
• Surveillance evidence, CCTV or recordings showing distribution or supply activity;
• Suspect's communications or financial records indicating involvement in drug conduct.

All evidence must be admissible, credible and reliable. If the evidential stage is not met, the prosecutor must not proceed to charge, even if the alleged conduct seems serious. The case may instead be closed or returned for further investigation.

2. The Public Interest Stage: Is Prosecution Appropriate?

If the evidential stage is satisfied, the prosecutor then considers whether a prosecution is in the public interest. This means evaluating whether criminal proceedings are justified, taking into account societal protection and the impact on all parties involved.

**Public Interest Factors

Although the full list is not exhaustive, relevant considerations often include:

• Seriousness of the offence: Drug supply, especially of Class A drugs, is usually considered serious.
• Harm caused: Economic damage, community impact, or risk to health.
• Culpability of the suspect: Whether conduct was deliberate, organised or opportunistic.
• Vulnerability of victims or witnesses: Including exploitation situations such as county lines operations.
• Suspect's circumstances: Such as youth, mental health or other mitigating factors.

The public interest stage ensures the prosecution is a proportionate response to the conduct alleged and serves the interests of justice.

Application of the Full Code Test in Practice

In drug cases, the Full Code Test is applied once investigators have collected key material and information. This may involve laboratory drug analysis, witness statements, surveillance data and other evidence critical to proving each element of the offence.

Some police forces and prosecutors operate a charging model where certain categories of cases must be referred to a Crown Prosecutor for a charging decision, ensuring the Full Code Test is properly applied.

Investigators can seek early prosecutor advice to guide evidence gathering and understand what material is needed to satisfy the test. This can improve case preparation and reduce delays.

Alternatives and the Threshold Test

In limited and urgent circumstances, the Threshold Test may be applied instead of the Full Code Test when the prosecutor believes further evidence will soon be obtained but immediate charging is necessary (for example, if the suspect poses a risk to public safety or is likely to abscond). The Threshold Test still requires reasonable grounds to suspect the offence and that it is in the public interest to charge.

However, the Threshold Test is not a substitute for the Full Code Test in routine drug cases and is only used sparingly where justified.

Common Questions About Charging Drug Offences

Does the Full Code Test Apply to All Drug Offences?

Yes. The Full Code Test is the standard charging framework for all drug offences that require a prosecutorial decision. This includes possession, supply, production and importation, provided the case is to be prosecuted in court.

What Happens if the Evidential Stage Is Not Met?

If the evidence does not support a realistic prospect of conviction, the prosecutor must not proceed with charges under the Full Code Test. The case may be closed or handed back for further investigation to strengthen evidence.

Is Public Interest Always Required?

Yes. Even if there is sufficient evidence, the prosecutor must still decide if prosecution is appropriate in the public interest. This protects the fairness and proportionality of criminal proceedings.

Summary

The Full Code Test is essential in criminal charging decisions, including those involving drug offences in England and Wales. It requires prosecutors to assess:

• Evidential adequacy: Whether the evidence provides a realistic prospect of conviction; and
• Public interest: Whether a prosecution is justified based on seriousness, harm and wider impact.

Both elements must be satisfied before a drug case can proceed to court. Understanding this process helps demystify how and why charging decisions are made, ensuring fairness and legal rigour in the criminal justice system.