Professor Peter Sommer, Visiting Professor of Digital Forensics at Birmingham City University and a Visiting Professor at De Montfort University Cyber Security Centre, discusses changes to the law around the collection of evidence from smartphones.
A police constable who has legally acquired your smartphone will now be able to explore not only its immediate content but also exploit links on it to external services including those relating to health, personal finance, sexual interests, social media memberships and the activities of employers.
That is the effect of S.173 Crime and Policing Act 2026. It will also remove any ambiguity about the right to probe linked cloud storage facilities such as iCloud, OneDrive, DropBox and their many rivals. The Act obtained royal assent last April but this section has not yet (as of October 2026) come into force.
All that will be required is a sign-off (which can initially be given verbally) from an inspector, the third lowest rank in the police. Hitherto much of this data was only available via a Production Order granted by a circuit court judge.
The Crime and Policing Act 2026 (C&PA 2026) is one of those omnibus multi-faceted items of legislation which cover several disparate areas; it has been all too easy to miss some of the new features. The headline items were: new anti-social behaviour orders, new laws on retail crime and shoplifting, an expansion of corporate criminal liability, increased penalties for weapon and knife sales, extended laws on child exploitation and stalking in general, an expansion of drug testing on arrest to specified Class B/C drugs, more police powers to enter and seize electronically tracked stolen goods without a warrant if impracticable, and a tightening of rules around protests near places of worship. Small wonder that this extension of powers of interrogating smartphone and computer devices searching did not attract much attention.
Digital Strip Searches
The examination of a smartphone is currently the most intrusive form of investigation used by law enforcement and others. Unlike interception and bugging which only capture what is being said at the time the relevant equipment is switched on, searches of smartphones and personal computers yield considerable historic data in the form of emails, texts, social media postings, photographs, videos and Internet queries. The average UK smartphone owner uses it for 4 hours each day.
There will be substantial documents, letters, notes, spreadsheets, files received from correspondents. There will be lists of contacts. The harvested material will not be limited to what was first originated and received on the immediate device under examination as owners tend to migrate data from an old device when a new one is acquired.
Digital forensic technicians can access nearly all of this material; in addition some deleted matter can be recovered. Data not normally visible but embedded within visible files – metadata – can also be extracted which can show the location of a phone, and hence its owner, at a specific time. This is particularly true of photos taken via the phone’s camera. Highly detailed accounts of a phone’s movement can be taken from GPS data – what makes the phone’s map app function – and also points at which the phone interacts with a bank ATM, or retail POS terminal or makes a public transport journey.
In the case of mobile phones law enforcement can apply for communications data which not only reports on who called whom, when and for how long, but also provides detail of the location of the phone when a call was made or received and, though with less detail, when the phone was in data mode to use the Internet including VOIP calls. This is cell-site analysis.
The Conundrum
Most people are keen for the police and intelligence/security services to use maximum techniques to prevent harm and detect wrongdoing. However they also have a very strong sense that some activities are private and should not normally be available to others. Balancing these clashing needs is a persistent problem throughout surveillance law.
The simplistic response to this conundrum is that law enforcement activity should be constrained and confined to what is “relevant” to a particular declared investigation. But achieving this ambition in practical terms is far from straight forward. There are three main problems. First, relevancy is established only after an investigation in which irrelevant material has been inevitably viewed and considered. Second, there is a conflict between ensuring that the acquired digital evidence is reliable, complete and can be trusted but also that any enquiry is limited to “relevancy”. Third, setting up a policy activity framework within which investigators are expected to comply – everything requires detail in legislation, Codes of Practice, police procedures, and the courts’ own Criminal Procedure Rules. These are all the more difficult to address as developments in smartphone software, applications and hardware (and indeed in computers more widely) mean that more data, different types of data and new forensic techniques are constantly appearing and are available for investigation. Laws that are current may not address technical realities. Evidence of compliance implies the making of records and notes.
Reliable Digital Evidence
From the perspective of an investigator or prosecutor any evidence said to come from a smartphone or other digital device must be reliable and complete if it is to persuade a court. The content of a smartphone changes millisecond by millisecond. It is listening out for receiving phone calls, texts, Internet traffic including web material, social media postings, VOIP calls, wifi traffic, Bluetooth traffic, over-the-air updates to apps, updates to iOS, Android or other operating system, At any point the owner may decide to edit or delete material. At the same time individual items – emails, photos, chat logs – purportedly extracted from a phone to become evidence can easily be forged.
To overcome this the practice is to carry out a formal set of steps in freezing the scene at a convenient specific point in time, usually very shortly after the device is in law enforcement possession. A complete copy of the contents of the phone (the same applies to other digital devices such as laptops, PCs) is created using a combination of specialist hardware, software and procedures. The complete copy contains much material which would normally be invisible to the regular user. Falsifying of or contamination of individual items on a phone then requires much greater technical effort if the entire copy – sometimes referred to a forensic image – is available as many visible changes to a file or record are usually accompanied by other changes elsewhere on the phone and exist within an overall context.
But at the end, police investigators have technical access to everything on that phone.
This approach to handling digital evidence has been a standard police procedure since the late 1980s – the so-called ACPO Principles.
Law enforcement acquisition of smartphones
Law enforcement have several routes to acquiring a smartphone for investigation; there have to be two stages – legitimate physical control and then subsequent access for content examination.
The easiest route is for law enforcement to request access from the owner. That won’t usually work for suspects but it can for victims and third-party witnesses. The concern of the victims will be for revelation of what they would prefer to keep private. Against that will be fear that refusal may mean that a complaint/potential crime will not then be investigated. Particular problems attend cases alleging sex-related crimes. Some re-assurance is provided by procedures set up by the Police, Crime, Sentencing and Courts Act 2022 and turned into some level of practicality by the use of a Digital Processing Notice or DPN which is designed by the College of Policing/ National Police Chiefs’ Council. The DPN defines the purpose of an investigation.
Where there is no voluntary provision of a device (among other routes):
- Under s.1 PACE 1984 (Police and Criminal Evidence Act) a constable may stop and search any person in a public place if there are reasonable grounds for suspecting the presence of stolen or prohibited items. Phones are included under s.1 powers but only as physical objects – separate authorisation is required to examine contents, usually obtained from a JP or judge.
- Under s.19 PACE, a constable who is lawfully on premises (often under a s.8 PACE search warrant) may seize anything they have reasonable grounds to believe is evidence of an offence under investigation,or has been obtained through the commission of an offence, provided it is necessary to seize it to prevent it being concealed, lost, altered, or destroyed. A s.8 warrant is authorised by a JP (magistrate) or Crown Court judge. No additional warrant is required for s.19 seizures.
- Under s.32 PACE, following an arrest, an officer may search the arrested person and their immediate surroundings for anything that might be used to assist escape or that is evidence of an offence. Phones are included under this power. No search warrant is required under s.32, simply reasonable belief on the part of the arresting constable. Under s.60 Public Order Act 2023 a person and vehicles can be searched without reasonable suspicion if they are within an area previously publicly designated by senior officers where they believe serious violence may occur.
- Under s.18 PACE, after arrest for an indictable (serious) offence, officers can search any premises the arrested person was in or controlled, and seize items found there.
- Under s 50 Criminal Justice and Police Act 2001 (CJPA) if during a lawful search of premises items are found which are thought to be of interest there is power to seize items which may be inextricably linked to others. Powers of seizure include both the seizable property and that from which it is not reasonably practicable to separate it. The items can be taken away and examined elsewhere.
- Under s 51 CJPA a similar power exists for extended seizure applies to seizure from a person.
- Under s 49 Regulation of Investigatory Powers Act 2000 (RIPA) there is a process by which law enforcement can demand access to encryption keys /PINs. Refusal is a criminal offence.
- Under Part 5 Investigatory Powers Act 2016 (IPA) an investigator can apply to his/her head of service (usually the Director General of the National Crime Agency) for an “equipment interference” warrant to hack – access remotely – a device. This warrant is subject to a “double lock” authorisation, which is granted by the Investigatory Powers Commissioner’s Office (IPCO).
There are, in principle, constraints on subsequent examination. The overarching constraint is under data protection law – GDPR (General Data Protection Regulation) – appearing in English Law via the Data Protection Act 2018. Part 3 of that Act, in a UK extension, deals with law enforcement processing.
- Necessity and Proportionality: Any interference with an individual’s right to privacy (Article 8 of the European Convention on Human Rights) must be necessary and proportionate to the purpose of the investigation. Investigators must consider less intrusive means of obtaining the information first.
- Warrants and Authorisation: Entry, search, and seizure often require a search warrant issued by a Justice of the Peace, Judge or the written authority of a senior officer, depending on the circumstances.
- Legal Professional Privilege (LPP): Material subject to LPP (confidential communications with a legal adviser) is generally protected from seizure. If a device containing LPP material is seized under “seize and sift” powers, it must be isolated and reviewed by an independent lawyer.
- Documentation and Audit Trail: Investigators must maintain a clear audit trail of all processes followed, and the device owner should generally be provided with a record of what was seized.
- Return of Property: Seized material can be retained for evidence or forensic examination, but if a copy or image of the data would suffice, the original device should generally be returned to its owner.
These principes are reflected in Codes of Practice issued under PACE – specifically Codes A and B. For example, Code B, which deals with searches of premises, includes the following (following ss 50 and 51 (CJPA 2001)
If an officer considers information stored in any electronic form and accessible from the premises could be used in evidence, they may require the information to be produced in a form which can be taken away and in which it is visible and legible, or from which it can readily be produced in a visible and legible form.
Practicalities of Examination
I have been examining computers for over 35 years and smartphones for as long as they have existed. There are very few special places in the storage areas of these devices where you can reliably expect to find definitive material to support a prosecution. Rather most of these devices even those belonging to relatively unsophisticated owners are complex scenes of crime. Data can be held in many different locations – folders, directories. The first action of any computer or smartphone investigator has to be to get a strong insight into how a particular device was being used by its owner. A digital forensics examiner will nearly always start with an overview of the device in front of him/her in order to get a sense of how it was used and the preoccupations of its owner.
Will the material of interest be in the form of an SMS text, a similar exchange via WhatsApp or its many analogues or via regular e-mail? Which of the many types of social media are being used? Do two people always use exactly the same medium of communication or do they sometimes use one form and then another, almost randomly? Are the first drafts to be found in a regular single location as might be the case for a smartphone where photographs taken on it are of interest or do they appear as attachments to emails or to text or a separate postings? Most people will probably use only one Internet browser but some may use more than one – Chrome and Safari or Firefox or Opera or Brave? If files are being bulk downloaded from elsewhere what software is being used, what records may exist of requests for files, where are the files themselves likely to be located? If the investigator is looking for the broader interests of the owner – TikTok, YouTube, SnapChat, Discord, Slack and so on.
The investigator may also want to form a view of the level of technical sophistication of the owner/user as in some cases that may be an alert that attempts have been made to conceal bad behaviour.
It follows, alas, from this that there is no easy way for an investigator simply to look at very small parts or a computer or a smartphone which are “relevant”. Rather they have to look at the lot and that means seeing a great deal that is irrelevant to an eventual inquiry and also, particularly in relation to smartphones, a high likelihood of material which is both irrelevant but which is private.
Two examples from cases of my own:
- A dealer had been approached by some men who intended to hijack some gold bullion and wanted it sold on. The dealer didn’t deny the approach but said – and the police and prosecutors eventually accepted – that he wanted nothing to do with any deal. An examination of his computers showed he was an enthusiastic customer of hostess services. Was he happy for his wife, family and friends to know?
- A man boasting he could source firearms was arrested by police. His computer was examined, among other things for photos of firearms and preferably of him with firearms. In the end not much was found but review of all the photos showed in graphic detail, sexual activity with (I think) his regular partner.
This means with a great deal of trust has to be placed in the hands of the investigator and the extent to which full notes are taken of the course of an investigation as the investigator justifies courses of action designed to fulfil its overt stated aims. But the reality is most investigators will not have time to write up the detailed notes which might satisfy critics. Our expectation of what police investigators can achieve has to be seen against the examination backlog – 20-25,000 devices awaiting examinations which are non-urgent. “Non-urgent” means no threat to life or immediately required to support an-ongoing current enquiry. The delays are of 6-9 months and the pressure on digital investigators from detectives, victims and the CPS can be intense. These pressures feed through to that other well-known delay backlog – of 81,000 Crown Court cases and the associated pressure when custody time limits of pre-trial remand of accuseds are breached. Making detailed notes of how “relevancy” was maintained and the care with which non-relevant material was managed may be a bit much.
The new powers
And now on to the new powers: Until recently any examination of a smartphone or other electronic device was limited to what was immediately recoverable from its storage. Or there was a lack of clarity about how access to third party services could be handled. Under s.173 Crime and Policing Act 2026 examination can be extended to using any online accounts to access remote services. These can include banking and finance, health information (via the NHS app, for example), remote storage including iCloud, OneDrive, DropBox and their many competitors and also could include situations where the device has access to employer’s computing facilities and those owned by third parties.
There are criteria: the information sought must be relevant to a reasonable line of enquiry, it must be necessary and proportionate and there doesn’t appear to be other means of obtaining the same information. An investigator needs the authorisation of a “senior officer” but this can mean an inspector, a relatively low rank. The power is limited to what was accessible at the time the device was seized. Authorisation can be given orally, but the authorising officer must eventually set down reasons in writing.
What is particularly interesting about this is that hitherto banking, health and similar information was only available to law enforcement by means of a Production Order under s. 9 and Schedule 1 of PACE. S.9 provided arrangements for a police constable to apply to a circuit judge of the Crown Court for access to “special procedure material” and “excluded material”. These are items which are not immediately available under a s. 8 PACE warrant. “Excluded material” includes medical records and journalistic material while “special procedure material” covers banking and business records.
But this same material would now be available once s.173 Crime and Policing Act 2026 comes into force. Will there be a Code of Practice? Will, notwithstanding what the legislation says, the Government decides that this level of intrusion requires the authority of a circuit judge?
Peter Sommer
The Ticker Tape blog is a collaboration from the Foundation for Information Policy Research and colleagues as a place to present ideas, analysis, arguments, and the latest research on technology, policy, and society.
