Artificial intelligence is becoming an increasingly familiar part of the criminal justice landscape. Much of the discussion has focused on how legal professionals might use AI to improve efficiency, but another question is rapidly emerging.
What happens when AI is no longer simply a tool used by lawyers or investigators, but becomes part of the evidence itself?
Whether through AI-generated images, manipulated audio recordings, enhanced video footage or AI-assisted police investigations, criminal defence solicitors are likely to encounter cases where understanding how artificial intelligence has been used becomes just as important as understanding the evidence itself.
The technology is evolving quickly. The legal principles that underpin a fair trial have not changed. The challenge for criminal defence practitioners is ensuring that those principles continue to be applied in an increasingly digital world.
AI is already influencing criminal investigations
The use of AI within policing is no longer a theoretical discussion.
In July 2026, the Government announced plans to modernise the criminal disclosure regime, including proposals for police to use AI to review, organise and summarise vast quantities of digital material. The reforms reflect the reality that many modern investigations involve hundreds of thousands, and sometimes millions, of digital documents, messages, emails and files that are impossible to review efficiently using traditional methods alone.
The objective is understandable. Digital evidence continues to grow at an unprecedented rate, placing enormous pressure on investigators and contributing to delays throughout the criminal justice system.
Used appropriately, AI may help identify relevant material more quickly and reduce the administrative burden associated with disclosure. That has the potential to benefit the wider justice system.
However, as AI becomes more closely integrated into investigations, criminal defence solicitors will increasingly need to understand not only the evidence itself, but also how that evidence has been identified, analysed or summarised.
When the technology itself becomes relevant
Traditionally, defence practitioners have challenged the reliability of witness evidence, forensic evidence or expert opinion. AI introduces another layer of scrutiny.
If an AI system has been used to prioritise digital material, generate summaries or enhance evidential content, questions naturally arise about the reliability of those outputs.
How was the technology used?
What instructions was it given?
Could important context have been overlooked?
Has the original material been preserved?
If an AI-generated summary is relied upon, does it accurately reflect the underlying evidence?
These are not questions about resisting technological progress. They are questions about ensuring transparency, disclosure and fairness—principles that already sit at the heart of criminal proceedings.
Deepfakes and digital authenticity
Alongside AI-assisted investigations comes another growing challenge – distinguishing genuine evidence from manipulated content.
Convincing AI-generated images, audio recordings and video can now be produced using widely available software. While many uses are entirely legitimate, the same technology also creates opportunities for fabricated or altered material to enter criminal investigations.
The existence of convincing deepfakes does not mean every digital image or recording should be viewed with suspicion. Equally, neither should authenticity simply be assumed because digital evidence appears persuasive.
As these technologies become more sophisticated, establishing provenance, preserving original files and understanding the history of digital evidence are likely to become increasingly important.
For criminal defence solicitors, careful scrutiny of digital material may become as routine as examining any other form of evidence.
Recent developments highlight the importance of safeguards
The importance of robust governance has already been demonstrated.
Earlier this year, a Derbyshire Police officer became the subject of a criminal investigation following allegations that AI had been used to create evidential material in a number of cases. The investigation remains ongoing, and it would be inappropriate to draw conclusions while enquiries continue. Nevertheless, the case has brought national attention to the importance of transparency, oversight and professional standards whenever AI is used within criminal investigations.
Around the same time, PoliceAI, the national centre established to support the responsible adoption of AI across policing, confirmed that some police forces had been advised to pause the use of commercially available AI tools for preparing court statements until appropriate safeguards could be established.
These developments do not suggest that AI has no place in policing. Rather, they demonstrate that those leading its adoption recognise the need for rigorous testing, governance and human oversight before AI-generated outputs can be relied upon within the criminal justice system.
Looking ahead
Artificial intelligence is likely to become an increasingly familiar feature of criminal investigations. It may help investigators manage ever-growing volumes of digital evidence, identify relevant material more efficiently and support the disclosure process.
For criminal defence solicitors, however, the focus is unlikely to be the technology itself.
It will be ensuring that long-established principles of fairness, disclosure and evidential reliability continue to apply, regardless of how evidence has been created, analysed or presented.
Technology will continue to evolve. The responsibility to scrutinise evidence, challenge its reliability where appropriate and protect the integrity of the criminal justice process remains exactly the same.
As AI becomes another feature of modern criminal practice, understanding how it has been used may become just as important as understanding what the evidence appears to show.
