How Are Sexual Offence Allegations Investigated? Understanding Evidence and Charging Decisions

Accused of a sexual offence can be overwhelming. Many people have little understanding of how these investigations work or what evidence the police require before a case can proceed.

Every case is different, but most investigations follow a number of common stages. Understanding the process can help you make informed decisions and appreciate the importance of obtaining legal advice at the earliest opportunity.

It Is Not Simply One Person's Word Against Another

One of the most common misconceptions about sexual offence investigations is that they are always a matter of one person's word against another.

While some cases may depend heavily on the accounts of those involved, investigators will usually seek evidence that either supports or undermines the allegation. The police have a duty to pursue all reasonable lines of enquiry, whether they point towards guilt or innocence.

Evidence may include:

• Mobile phone downloads and messages
• Social media communications
• CCTV footage
• Location and tracking data
• Medical or forensic evidence
• Witness statements
• Previous communications between the parties
• Digital devices such as laptops, tablets, and computers

In many investigations, digital evidence plays a significant role and may take many months to review and analyse.

Police Interviews

If you are arrested or invited to attend a voluntary police interview, that interview will form an important part of the investigation.

A voluntary interview does not mean that the allegation is any less serious. Anything you say during questioning may later be relied upon in court proceedings.

Before answering questions, you are entitled to obtain legal advice from a solicitor. This allows you to understand the allegation, consider the available evidence, and receive advice on how best to proceed.

What Happens After the Investigation?

Once the police have gathered the available evidence, they will assess whether there is sufficient material to justify a charging decision.

For more serious sexual offences, the police will often submit the case file to the Crown Prosecution Service (CPS), which is responsible for deciding whether criminal charges should be authorised.

The CPS applies a two-stage test before commencing a prosecution.

1. Is There a Realistic Prospect of Conviction?

The first question is whether the available evidence provides a realistic prospect of conviction.

This does not mean that guilt must be proven beyond reasonable doubt at this stage. Instead, prosecutors consider whether a properly directed jury or magistrates would be more likely than not to convict on the evidence available.

If this evidential test is not met, the case should not proceed.

2. Is a Prosecution in the Public Interest?

If there is sufficient evidence, prosecutors must then consider whether bringing criminal proceedings is in the public interest.

In cases involving serious sexual offences, the public interest test will often favour prosecution, although every case is assessed on its own facts and circumstances.

Why Do Some Cases Take So Long?

Sexual offence investigations can often be lengthy and complex.

Police may need to:

• Examine large volumes of text messages and communications
• Download and review mobile phone data
• Obtain expert forensic reports
• Interview multiple witnesses
• Analyse CCTV footage
• Review social media and other digital evidence

As a result, it is not unusual for investigations to last many months before a charging decision is made.

The Importance of Early Legal Advice

Many people wait until they have been charged before instructing a solicitor. In reality, some of the most important decisions are made during the investigation stage.

An experienced criminal defence solicitor can:

• Provide advice before and during a police interview
• Ensure your legal rights are protected
• Help identify evidence that supports your account
• Make appropriate representations during the investigation
• Explain the process clearly and keep you informed throughout

Obtaining legal advice at an early stage can help you approach the investigation with a full understanding of both your rights and the legal process.

Every Case Turns on Its Own Facts

No two sexual offence investigations are identical. The available evidence, the credibility of witnesses, and the surrounding circumstances all play a role in determining whether a case proceeds to court.

If you are under investigation or have been asked to attend a police interview, obtaining specialist legal advice as early as possible can help you understand the process, protect your interests, and ensure your rights are safeguarded throughout the investigation.

Frequently Asked Questions

How do police investigate sexual offence allegations?

Police investigations will usually involve gathering and assessing evidence relating to the allegation. This may include statements from those involved, witness evidence, mobile phone data, messages, social media communications, CCTV, location data and medical or forensic evidence. The precise nature of the investigation will depend on the circumstances of the individual case.

What evidence is used in a sexual offence investigation?

Evidence can include text messages, social media communications, CCTV footage, mobile phone and location data, medical or forensic evidence, witness statements and previous communications between the parties. Digital evidence can be particularly important and may take considerable time to obtain and analyse.

Is a sexual offence allegation simply one person's word against another?

Not necessarily. Although the accounts of the people involved may be important, police will usually look for other evidence that supports or undermines the allegation. Investigators are required to pursue reasonable lines of enquiry that may point towards either guilt or innocence.

What happens if I am invited to a voluntary police interview?

A voluntary police interview should be taken seriously. Although you are not under arrest, what you say during the interview may later be relied upon in criminal proceedings. You are entitled to obtain legal advice from a solicitor before answering police questions.

Can I have a solicitor at a police interview?

Yes. If you are arrested or asked to attend a voluntary police interview, you are entitled to legal advice. A solicitor can advise you about the allegation and the interview process and help ensure that your legal rights are protected.

Who decides whether someone is charged with a sexual offence?

Once the police have gathered the available evidence, a decision will be made about whether the case should proceed. In more serious sexual offence cases, the police will often refer the case to the Crown Prosecution Service (CPS), which considers whether criminal charges should be authorised.

What does the CPS consider before bringing charges?

The CPS applies a two-stage test. Prosecutors first consider whether there is sufficient evidence to provide a realistic prospect of conviction. If that evidential test is satisfied, they then consider whether a prosecution is in the public interest.

How long does a sexual offence investigation take?

There is no fixed timescale. Sexual offence investigations can take many months, particularly where police need to examine substantial amounts of digital evidence, obtain forensic reports, review CCTV or interview multiple witnesses. Every investigation will depend on its own circumstances.

Should I contact a solicitor before I have been charged?

You do not need to wait until you have been charged to obtain legal advice. Important decisions can be made during the investigation stage, including during a police interview. Seeking specialist criminal defence advice at an early stage can help you understand the process, identify relevant evidence and protect your legal rights.

What happens if there is not enough evidence to charge?

If the evidential test required for prosecution is not met, the case should not proceed to prosecution. Whether there is sufficient evidence will depend on the facts and evidence available in the individual case.