Last reviewed: September 2026
The legal framework
Most conventional controlled-drug offences are prosecuted under the Misuse of Drugs Act 1971. The allegation may concern possession, supply or offering to supply, possession with intent to supply, production or cultivation. Conspiracy allegations may involve separate conspiracy law. The precise charge matters because the prosecution must prove the legal elements of that offence against the particular defendant.
A drug case should therefore be broken down into questions: what substance is alleged, how has it been identified, where was it found, who controlled that location or item, what proves knowledge, what proves an intention to supply, and what evidence connects the defendant to any wider activity?
Possession
Physical proximity is not always the same as legal possession. If drugs are found in a vehicle, house, bag or shared location, the prosecution still needs to establish the defendant’s connection to the substance and the necessary knowledge. The surrounding circumstances may include ownership or control of the premises, fingerprints or DNA, admissions, messages, CCTV, observations and the accounts of other occupants.
In shared premises, attribution can be especially important. The defence should identify who had access, where the item was found, whether the location was private or communal, and whether the prosecution theory is consistent with the objective evidence.
Possession with intent to supply
Intent is commonly inferred from circumstances rather than proved by a direct admission. Quantity, packaging, scales, cash, lists, multiple phones, message traffic and expert evidence may all be relied upon. None should be treated in isolation. Quantity may be consistent with different explanations depending on the substance and context. Cash requires a proven evidential connection. A phone may contain messages belonging to more than one user or conversations capable of more than one interpretation.
The defence should test both the underlying facts and the inference drawn from them. If the prosecution says an item is evidence of dealing, the question is why, and whether there is a credible alternative explanation supported by other material.
Supply and conspiracy
Supply allegations may arise from an observed transaction, a controlled operation, messages, admissions, witness evidence or an inference from possession and surrounding circumstances. Conspiracy cases can be broader. The prosecution may allege an agreement involving multiple people, sometimes over a long period and across many communications.
A conspiracy indictment does not mean every defendant had the same role or knowledge. The defence should identify the alleged agreement, its scope, the period, the participants and the evidence said to prove that this defendant joined it. Association with another person is not by itself proof of participation in a criminal agreement.
Phones, encrypted messages and digital evidence
Digital material is central to many modern drug prosecutions. The first issue is attribution: who was using the device, account, number or handle at the relevant time? The second is meaning: are the messages clear, coded, ambiguous, social or capable of innocent explanation? The third is completeness: is the prosecution relying on selected extracts from a much larger data set?
Phone downloads can also contain location data, photographs, contacts and application data. Defence review should consider material that undermines the prosecution interpretation, not just the messages selected for the served case. Where extraction is incomplete or the underlying data has not been made available, disclosure issues may arise.
Cash and financial evidence
Cash can be relied upon as circumstantial evidence, but it must be placed in context. Legitimate income, withdrawals, business activity, gifts, savings and other sources may be relevant. In larger cases investigators may analyse bank accounts, transfers, cryptocurrency or alleged unexplained wealth. Financial evidence should be reconciled rather than answered with broad assertion.
Searches of homes, vehicles and phones
Drug investigations frequently involve searches under warrant or statutory police powers. The defence should obtain and examine the record of the search, the basis for seizure and the continuity of exhibits. Where the legality or execution of a search is material to the case, the relevant power and circumstances may need separate analysis.
If a phone is seized, investigators may retain it for examination. The status of the download, the scope of extraction and the need for continued retention can all be relevant to case management and disclosure.
Forensic and expert evidence
Laboratory evidence may establish the nature and purity of a substance. Other expert evidence may address valuation, patterns said to indicate supply, digital material, cell-site data or financial analysis. Expert evidence should be tested for methodology, assumptions and whether the conclusion actually follows from the underlying facts.
County lines and alleged role
Some prosecutions allege organised distribution models and assign defendants particular roles. Role is important both to liability and, after conviction, sentence. A defendant may dispute involvement entirely or dispute the scale, duration or function attributed to them. Messages, travel, financial material and relationships should be examined against the prosecution’s role description.
Where there are indicators of exploitation, coercion or modern slavery, that can require specialist consideration. Such issues are fact-sensitive and should be raised carefully with the defence team rather than assumed.
Police interview strategy
Drug investigations can involve limited police disclosure before interview and extensive digital material that has not yet been reviewed. Interview strategy should therefore be evidence-led. The solicitor should understand what is alleged, what material has been disclosed, what the client can reliably address and whether further evidence is likely to emerge.
A full-comment interview, prepared statement, selective answer or silence each carries consequences. There is no universally correct approach. The right strategy depends on the known evidence, the client’s account and the legal risks at that stage.
Pre-charge representations
Where the investigation remains open, focused representations may be appropriate if there is material capable of changing the charging decision. Examples can include proof of legitimate ownership or income, evidence undermining attribution, witness material, chronology, medical evidence, digital material or a legal point affecting the proposed offence.
Representations are strongest when they engage with the actual prosecution theory and evidence. They should not simply repeat the interview account in longer form.
After charge: Magistrates’ Court and Crown Court
The route after charge depends on the offence and seriousness. More serious supply, production and conspiracy allegations are commonly dealt with in the Crown Court. Preparation may involve extensive digital schedules, expert evidence, disclosure review and analysis of co-defendant cases.
Confiscation and POCA
A criminal conviction can be followed by confiscation proceedings under the Proceeds of Crime Act 2002. The financial case may be complex and separate from the trial issues. Benefit, available amount, assets, third-party interests and enforcement can require detailed documentary work. Our practice includes POCA and financial-crime issues as well as the underlying prosecution.
Sentencing considerations
Where there is a guilty plea or conviction, sentence can depend on the nature of the drug, quantity, role, culpability, harm and personal circumstances, together with any aggravating and mitigating factors. The court’s assessment of role should be based on evidence. It should not be accepted automatically because of the way the prosecution describes the case.
Funding
Theodorous holds a Legal Aid Agency criminal contract and can advise on public funding where available. We also undertake privately funded drug cases, including investigation-stage work, pre-charge representations, complex digital review and Crown Court preparation.
Frequently asked questions
The drugs were found in a shared house. Does that make everyone guilty?
No. The prosecution must prove the case against each individual. Location, control, knowledge and the surrounding evidence all matter.
Can messages alone prove supply?
Messages can be important evidence, but attribution, context, completeness and interpretation are all capable of dispute. The whole evidential picture matters.
What if the police say cash proves dealing?
The source, amount, circumstances and connection to any alleged criminal activity must be considered. Evidence of a legitimate source can be important where it exists.
Can you act before I am charged?
Yes. Investigation-stage advice, bail issues, evidence preservation and pre-charge representations are significant parts of our criminal practice.