How Do Police Investigate Harassment Offences?

Harassment offences are taken seriously by law enforcement in England and Wales. When someone is subjected to repeated, unwelcome behaviour that causes alarm, distress or fear, this may amount to a criminal offence under the Protection from Harassment Act 1997. The police play a crucial role in responding to reports, investigating allegations, gathering evidence, and working with prosecutors to secure just outcomes. 

This article explains how police investigate harassment offences step by step, including legal definitions, investigative powers, procedures, victim and suspect rights, and common issues that may arise.

What Is Harassment Under UK Law?

Harassment in criminal law is defined under the Protection from Harassment Act 1997 (the 1997 Act). An offence is committed where a person:

• engages in a course of conduct involving at least two acts; and
• that conduct amounts to harassment of another person; and
• the person knows or ought to know their conduct amounts to harassment. 

Harassment can include repeated unwanted phone calls, messages, following someone, loitering near home or workplace, threats, or other actions that cause alarm or distress. 

Police also investigate related offences such as stalking (which is harassment with specific associated behaviours), racially or religiously aggravated harassment, and public order offences that involve threatening or abusive behaviour likely to cause harassment, alarm or distress. 

Step 1: Reporting Harassment to the Police

Investigation begins when a report is made via:

• 999 in emergencies
• 101 non‑emergency
• Online reporting forms on police.uk
• In‑person reports at a police station 

Officers encourage reporting early rather than delaying to gather evidence yourself. Anything you already have (texts, photos, screenshots) can assist investigators, but you should not wait to report to collect evidence. 

Police will record the incident and allocate the case according to force policy and guidance, recognising that harassment often forms part of ongoing behaviour rather than a single event. 

Step 2: Initial Response and Safety Assessment

Upon receiving a report, the police will:

• Assess immediate risk to the victim and others
• Take an initial statement
• Conduct a risk assessment to identify urgency of safeguarding and further action
• Record the incident on official systems to ensure it is formally investigated 

Risk assessments may consider whether the behaviour is escalating, if there are vulnerable people involved, and whether associated offences (e.g. stalking or domestic abuse) are present. 

Police should also provide information on support services and explain how the investigation process can work, including victim liaison and updates. 

Step 3: Evidential Gathering and Investigative Powers

Once the offence is recorded, the investigation focuses on gathering evidence to demonstrate:

• the course of conduct (i.e. repeated behaviour)
• the impact on the victim
• what the suspect knew or ought to have known about the effect of their behaviour 

Police Powers Used in Investigations

Officers use their powers under the Police and Criminal Evidence Act 1984 (PACE) and common law to progress investigations, including:

• Arresting suspects where necessary (e.g. to prevent further offending or secure evidence)
• Interviewing suspects under caution
• Search and seizure of premises or devices with lawful authority, including mobile phones, computers, and written records
• Use of bail or released under investigation with conditions to protect victims and preserve evidence
• Recording and preservation of digital evidence such as messages, social media posts, and call logs 

Police policy guidance stresses that investigations should be suspect‑focussed, examining the suspect's history, behaviour before, during and after incidents, and all reasonable lines of enquiry, not only those reliant on the victim's testimony. 

Step 4: Specialist Handling and Single Point of Contact

Many forces designate a Single Point of Contact (SPOC) or specialist officer to handle harassment and stalking cases. These roles aim to:

• Improve consistency in investigations
• Support officers with training and policy guidance
• Help liaise with victim support agencies
• Guide investigations in line with protocols developed jointly with the Crown Prosecution Service (CPS) 

Investigators are advised to consider patterns of behaviour as a whole, rather than treating each incident in isolation. 

Step 5: Referral to Crown Prosecution Service

Once sufficient evidence is gathered, police prepare a case file and refer it to the Crown Prosecution Service (CPS). The CPS then applies the Full Code Test, which includes:

1. Evidential stage – sufficient evidence for a realistic prospect of conviction
2. Public interest stage – prosecution is appropriate in the circumstances 

Investigators work closely with prosecutors to ensure evidence and risk information is comprehensive. This partnership is crucial, as harassment cases often overlap with other offences such as stalking or domestic abuse. 

Step 6: Protective Measures and Civil Remedies

While the investigation and prosecution proceed, police and courts may consider measures to protect victims, such as:

• Restraining orders under the Protection from Harassment Act 1997, which prohibit contact or certain behaviours by a defendant after conviction (or in some cases even after acquittal if necessary) 
• Civil injunctions requiring a person to stop harassing behaviour, enforceable through civil courts and potentially leading to compensation awards 

Protective measures can reduce risk and may operate alongside criminal proceedings.

Time Limits for Prosecution

Criminal harassment offences are generally summary only under the 1997 Act, meaning prosecution must normally begin within six months of the most recent incident in the course of conduct. 

Where offences are more serious, or overlap with other crimes, prosecutors may also consider alternative charges that carry longer time limits.

Rights of Victims

Victims are entitled to:

• Information about the investigation and prosecution
• Support and safeguarding referrals
• Consideration of special measures when giving evidence
• Access to civil remedies if criminal prosecution does not proceed 

Police should communicate clearly about case progress and the role of the CPS.

Rights of Suspects

Suspects have statutory rights including:

• The right to legal representation
• The right to remain silent during police interviews
• The right to challenge evidence at court
• Protection under PACE and related safeguards in detention and questioning 

Police must balance investigatory rigor with respect for suspects' legal rights.

Challenges in Harassment Investigations

Investigating harassment offences may be complex because:

• Evidence may be subtle, dispersed or digital
• Behaviour must form a course of conduct, not single isolated acts
• Victims may be reluctant to give statements
• Harassment can intersect with stalking, public order, or domestic offences

Police forces have worked to improve training and investigative consistency, but national reviews have highlighted variation in practice and the need for ongoing improvement. 

Final Thoughts

Police investigations of harassment offences in England and Wales are systematic and governed by statutory law, established police powers, and joint protocols with prosecutors. The process begins with reporting, proceeds through risk assessment and evidence gathering, and culminates in referral to the CPS for charging decisions. Throughout, safeguarding victims and pursuing evidence that demonstrates patterns of behaviour are central priorities.

Understanding how police investigate harassment offences can help victims and others engage effectively with the criminal justice system, and clarify how their cases are handled from initial report to potential prosecution.