Drug supply investigations do not always involve a single suspect.

Police may arrest several people following a search, vehicle stop or wider investigation and allege that they were working together. One person may have physically possessed the controlled drugs, another may have handled money, another may have provided transport, while somebody else may be accused of helping to organise the activity.

This can raise questions about what is commonly referred to as joint enterprise.

A person does not necessarily have to physically supply drugs themselves to face criminal liability for participating in another person’s offence. Depending on the evidence, someone who intentionally assists or encourages an offence may potentially be prosecuted even though another person carried out the principal criminal act.

However, simply knowing somebody involved in drugs, being present when an offence occurs or associating with a suspected drug dealer does not automatically make a person criminally responsible.

The prosecution must prove the legal basis on which the individual is said to have participated in the offence.

This article explains how secondary liability can arise in drug supply cases in England and Wales, the evidence that may be relevant and why presence or association alone is not necessarily enough.

What Does “Joint Enterprise” Mean?

“Joint enterprise” is a commonly used expression rather than the name of a separate criminal offence.

It has traditionally been used to describe situations where two or more people participate in criminal activity and questions arise about their respective liability.

In legal terms, the focus is generally on secondary liability.

A person who actually commits the offence is often described as the principal offender. Another person may potentially be liable where they intentionally assist or encourage the commission of that offence.

This distinction can be particularly important in drug supply cases because different people may allegedly perform different functions.

Can You Be Guilty If You Did Not Personally Supply the Drugs?

Potentially, yes.

A defendant does not necessarily have to be the person who physically hands controlled drugs to another individual to incur liability.

The prosecution may allege that somebody assisted or encouraged another person’s offence.

The precise legal analysis depends on the offence charged and the facts of the case.

For example, evidence might be relied upon to allege that a defendant knowingly helped another person carry out drug supply by performing a particular role.

However, the prosecution must establish the necessary participation and mental element.

It is not enough simply to show that the defendant knew the principal offender or was nearby.

What Is Secondary Liability?

Secondary liability concerns circumstances in which a person can be held responsible for assisting or encouraging another person’s offence.

The Accessories and Abettors Act 1861 provides that a person who aids, abets, counsels or procures the commission of an indictable offence may be tried, indicted and punished as a principal offender.

Modern case law has clarified how these principles should be applied.

The prosecution generally needs to prove that the defendant intentionally assisted or encouraged the commission of the offence and had the necessary knowledge concerning the essential matters relating to that offence.

This means that participation and intention are central.

What Changed After R v Jogee?

The Supreme Court’s 2016 decision in R v Jogee is a major authority concerning secondary liability.

Before Jogee, the law had developed in a way that allowed foresight that another person might commit an offence to play a particularly significant role in establishing liability.

The Supreme Court held that the law had taken a wrong turn.

Foresight is evidence from which intent may be inferred, but it is not itself the legal test for intention.

This distinction matters.

A person should not be convicted merely because they foresaw that another individual might commit an offence. The prosecution must establish the required intentional assistance or encouragement.

In drug cases involving several defendants, the evidence must therefore be analysed carefully to determine what each person actually did and intended.

How Can Joint Liability Arise in Drug Supply Cases?

Drug supply can involve multiple roles.

The prosecution may allege, depending on the circumstances, that different individuals contributed to the commission of an offence in different ways.

For example, allegations may concern:

• Handling or transporting controlled drugs;
• Storing drugs;
• Helping arrange transactions;
• Acting in support of another participant;
• Handling money connected with supply;
• Providing relevant information;
• Assisting with communications; or
• Otherwise intentionally facilitating the commission of an offence.

These examples do not mean that performing any particular action automatically creates criminal liability.

The prosecution must establish the relevant offence and the defendant’s intentional participation in it.

Is Being Present During a Drug Deal Enough?

Mere presence is not automatically enough.

A person may be physically present when an offence occurs without assisting or encouraging it.

The circumstances surrounding that presence can nevertheless be relevant.

For example, prosecutors may seek to establish that a person’s conduct went beyond passive presence and amounted to intentional assistance or encouragement.

The defence may argue that the defendant was simply present and did nothing to participate.

The court must determine what the evidence actually establishes.

Presence therefore needs to be distinguished from participation.

What If You Knew Someone Was Selling Drugs?

Knowledge alone does not necessarily make somebody responsible for another person’s offence.

Knowing that a friend, relative or acquaintance is involved in drug activity does not automatically establish that the person intentionally assisted or encouraged that activity.

The prosecution needs evidence connecting the defendant to the commission of the alleged offence.

However, knowledge can become relevant when combined with evidence of assistance.

For example, the prosecution may seek to prove that an apparently ordinary act was performed specifically to help another person’s criminal activity.

The defendant’s knowledge and intention can then become central issues.

Can You Be Liable for Driving Someone?

Driving another person does not automatically amount to participation in drug supply.

People give lifts for countless legitimate reasons.

However, the prosecution may allege secondary liability if it can establish that the driver intentionally provided transportation in order to assist the commission of a drug offence.

The difference lies in what the driver knew and intended.

A driver who genuinely had no knowledge of the criminal activity presents a very different case from someone whom prosecutors can prove knowingly and intentionally facilitated it.

Evidence concerning communications, journey patterns, behaviour and the surrounding circumstances may therefore become relevant.

What If Drugs Are Found in a Car with Several People?

The discovery of controlled drugs inside a vehicle does not automatically mean that every occupant possessed them or participated in supply.

The prosecution must establish the relevant involvement of each defendant.

Questions may include:

• Where were the drugs found?
• Who knew they were present?
• Who exercised control over them?
• Who owned or controlled the vehicle?
• What was the purpose of the journey?
• What communications exist?
• What did each occupant do?
• Is there evidence of intentional assistance?

The answers may differ for each individual.

Simply sitting in a car containing drugs does not, without more, establish participation in drug supply.

What If Drugs Are Found in a Shared House?

Similar issues arise where police find drugs in accommodation occupied by several people.

The Crown Prosecution Service guidance concerning possession specifically recognises that mere knowledge of the existence of drugs is not enough to establish joint possession where premises are occupied by more than one person.

Evidence is required to establish participation.

This can be particularly important in houses, flats or other shared accommodation.

Investigators may examine where the drugs were found, who used the relevant room, whether personal belongings were present, whether there is forensic evidence and what communications or other material connect particular occupants to the drugs.

The prosecution must prove its case against each defendant individually.

Is Knowing About Drugs Enough for Joint Possession?

No.

Knowing that controlled drugs are present and jointly possessing them are not necessarily the same thing.

Possession involves issues of knowledge and control.

Where several people are present, the prosecution must establish why a particular person should legally be regarded as possessing the drugs.

This can become particularly important where drugs are hidden in a communal location or belong to another occupant.

The existence of several suspects does not remove the prosecution’s obligation to prove the necessary elements against each defendant.

Can Mobile Phone Evidence Be Used to Prove Participation?

Yes, relevant digital communications can potentially form an important part of the prosecution evidence.

Where lawfully obtained, investigators may examine messages and other communications to establish relationships between suspects and their alleged roles.

The prosecution may seek to rely on communications as evidence that defendants coordinated activity or knew what was taking place.

However, digital evidence must be properly interpreted and attributed.

Questions may include:

• Who owned the phone?
• Who actually used it?
• Who authored particular communications?
• What did the messages mean?
• Do they genuinely relate to drug supply?
• Do they demonstrate knowledge only, or intentional participation?

These distinctions can be critical.

Can Cash Be Used as Evidence?

Cash may also become relevant.

Investigators may examine whether money can be connected with alleged drug activity.

However, possession of cash does not automatically establish involvement in drug supply.

A defendant may have a legitimate explanation for the funds.

In possession with intent to supply cases, CPS guidance also makes the important point that money may potentially provide evidence of past supply but does not, on its own, prove a future intention to supply.

The significance of cash therefore depends on the wider circumstances.

What About Scales and Packaging?

Drug-related equipment can also feature in multi-defendant cases.

CPS guidance identifies items such as weighing scales, cutting agents, bags and foil wraps as evidence that may potentially support an inference of intent to supply where their presence is not simply consistent with normal domestic use.

However, where several people have access to a property, the prosecution may need to establish who possessed or controlled those items and how they relate to each defendant.

An object being present in a shared property does not automatically make every occupant responsible for it.

What Is “Being Concerned in the Supply” of Drugs?

Drug supply law also contains offences that should not be confused with secondary liability.

Section 4(3) of the Misuse of Drugs Act 1971 includes offences of being concerned in the supplying of a controlled drug to another and being concerned in making an offer to supply.

These are substantive statutory offences.

This means prosecutors may, depending on the evidence, consider offences involving participation in the supply process itself rather than relying solely on secondary liability principles.

The precise charge matters because different offences have different legal elements.

Anyone accused of participating in drug supply should therefore obtain advice based on the specific allegation rather than assuming that every multi-person prosecution is legally the same.

What Evidence May Show Participation?

There is no single type of evidence that automatically proves participation in a drug supply offence.

The prosecution may rely on a combination of evidence, potentially including:

• Communications between defendants;
• Surveillance;
• CCTV;
• Witness testimony;
• Controlled drugs;
• Packaging and weighing equipment;
• Cash or relevant financial evidence;
• Vehicle movements;
• Documents;
• Forensic evidence;
• Admissions;
• Conduct before, during or after the alleged offence; and
• Evidence concerning each defendant’s alleged role.

The evidence must demonstrate more than mere association where secondary liability is alleged.

Does Association with a Drug Dealer Make You Guilty?

No.

Criminal responsibility is personal.

Being friends with, related to or associated with someone who commits drug offences does not automatically make another person guilty.

The prosecution must establish the defendant’s own participation in the relevant offence.

This is particularly important in investigations involving friendship groups, families or people sharing accommodation.

Association can provide context, but it is not a substitute for proof of criminal participation.

Can You Be Responsible If You Never Touched the Drugs?

Potentially, yes.

Physical contact with the controlled drugs is not always necessary for criminal liability in a supply case.

Depending on the charge and evidence, a person may be alleged to have intentionally assisted or encouraged the offence without personally handling the drugs.

Equally, the absence of physical contact can be highly relevant where prosecutors lack other evidence demonstrating participation.

The issue must be assessed in light of the whole case.

What If You Changed Your Mind?

Questions can also arise where someone initially became involved but later attempted to withdraw from criminal activity.

Withdrawal from participation is a legally complex area and depends heavily on the facts, including the nature of the assistance already provided and what steps were taken to withdraw.

Simply changing one’s mind privately may not necessarily resolve liability for assistance already provided.

Anyone facing allegations involving withdrawal from a joint offence should obtain specific legal advice.

Can Someone Play a Minor Role and Still Be Convicted?

Potentially, yes.

The fact that one defendant played a smaller role than another does not necessarily prevent liability if the prosecution proves intentional participation in the offence.

However, the extent of involvement can be extremely important.

First, it may affect whether the legal elements of the alleged offence are established at all.

Second, if there is a conviction, the defendant’s role can significantly affect sentencing.

Why Does Role Matter at Sentencing?

The Sentencing Council guideline for drug supply and possession with intent to supply assesses an offender’s role as part of determining the appropriate sentence.

The guideline distinguishes between:

• Leading role;
• Significant role; and
• Lesser role.

A leading role can include organising or directing buying and selling on a commercial scale or having substantial links to and influence on others in a chain.

A significant role involves a level of operational or management function or other substantial involvement.

A lesser role can include limited functions performed under direction, limited awareness or understanding of the overall operation, or involvement through pressure, influence or exploitation in appropriate circumstances.

The precise guideline criteria must be applied to the facts.

This means that two defendants involved in the same wider drug operation may receive different sentences because their roles were substantially different.

What About Vulnerability or Exploitation?

The circumstances in which a defendant became involved can be relevant, particularly when assessing role and sentence.

The Sentencing Council guideline recognises factors including pressure, coercion, intimidation and exploitation when determining whether a lesser role is appropriate.

This can be particularly significant in cases where an individual was used by more organised offenders to perform a limited function.

However, these issues are fact-specific and require careful evidence.

How Can Joint Enterprise Allegations Be Challenged?

The appropriate defence depends on the prosecution case.

A solicitor may need to examine:

• What offence the defendant allegedly assisted or encouraged;
• What the defendant actually did;
• Whether the alleged conduct amounted to assistance or encouragement;
• What the defendant knew;
• Whether the defendant intended to assist or encourage the offence;
• Whether the defendant was merely present;
• Whether digital evidence is correctly attributed;
• Whether drugs or equipment can actually be linked to the defendant;
• Whether the defendant had control over drugs found in a shared location;
• Whether the prosecution is relying improperly on association; and
• Whether there is a legitimate explanation for the defendant’s conduct.

In a multi-defendant case, evidence should be considered separately in relation to each accused person.

Does the Prosecution Have to Prove an Agreement?

Not every secondary-liability case requires proof of a formal agreement.

Criminal participation can potentially be established from conduct and surrounding circumstances.

However, the prosecution must prove the elements required for the particular basis of liability alleged.

It cannot simply assume an agreement because defendants know one another or were present together.

The court must consider what each person did and intended.

Can All Defendants Receive the Same Sentence?

Not necessarily.

Even where several defendants are convicted in connection with the same drug operation, sentencing is individual.

The court considers each offender’s role, the harm category, aggravating and mitigating factors and personal circumstances relevant under the sentencing framework.

One defendant may have organised the activity while another performed a much more limited function.

Their sentences may therefore differ substantially.

Conclusion

A person does not necessarily have to physically sell or handle controlled drugs to face criminal liability in a drug supply case.

Where the prosecution alleges secondary liability, the central issue is whether the defendant intentionally assisted or encouraged the commission of another person’s offence with the required knowledge and intent.

However, criminal liability cannot be based simply on friendship, association or presence.

Knowing someone involved in drug dealing does not automatically make another person guilty. Sitting in a vehicle containing drugs does not automatically establish participation. Living in a property where controlled drugs are found does not necessarily establish joint possession.

The prosecution must prove the relevant case against each defendant.

Mobile phone evidence, surveillance, drugs, cash, scales, packaging, vehicle movements, witness testimony and forensic evidence may all potentially be used to establish participation, but their significance depends on the circumstances.

The Supreme Court’s decision in R v Jogee also makes an important distinction: foresight that another person might commit an offence can be evidence of intention, but foresight is not itself the legal test for intention.

Anyone accused of participating in drug supply alongside others should seek specialist criminal defence advice as early as possible. Multi-defendant cases can involve complicated questions of possession, participation, intention and secondary liability, and the evidence relating to each defendant should be considered individually.