Investigator
The investigator examines crimes, gathers evidence, and interrogates witnesses.
On this profession page, you will learn:
Who is investigator
The investigator daily examines the circumstances of crimes, gathers evidence, and conducts witness interrogations. He meticulously analyzes information to reconstruct the events leading up to the crime. The investigator studies the materials of criminal cases and collaborates with experts to understand the technical details that can aid the investigation. He visits crime scenes, takes photographs, collects forensic materials, and documents all critical moments. During interrogations, the investigator poses questions in such a way as to gather maximum information from witnesses. He manages emotions while maintaining a neutral tone to create a trusting atmosphere. After collecting all data, the investigator compiles reports detailing procedures and results to present them to the court.
AI impact on investigator
Low riskAI replacement risk
25%
You'll spend less time typing up routine reports and sorting through piles of documents because AI can draft summaries and spot patterns in case files quickly. The work that stays is what actually matters: standing face to face with witnesses, reading whether someone is lying, and deciding how to search a scene or make an arrest without breaking trust or safety. Most days you’ll still be out talking to people, checking evidence with your own eyes, and figuring out which lead is worth chasing while software handles the paperwork.
Tasks at risk of automation
- report drafting
- document review
- initial data sorting
Tasks that will remain human
- crime scene examination
- witness and suspect interviews
- arrests and searches
- court case preparation
- inter-agency collaboration
Key skills of investigator
Work schedule and conditions
A detective typically works 8 hours a day. The days off are Saturday and Sunday. Office work is primary, but there may be opportunities for fieldwork. There are no special working conditions, but stressful situations can arise. Often, it is necessary to work on urgent cases.
What a investigator does
- Collect and analyze evidence at the crime scene.
- Interview witnesses and suspects.
- Prepare reports of conducted investigative actions.
- Examine documents and other case materials.
- Collaborate with other law enforcement agencies.
- Conduct searches and arrests.
- Prepare cases for court trial.
Benefits of the investigator profession
Higher purpose
Assisting in solving crimes.
Variety of tasks
Daily work with new cases.
Teamwork
Collaboration with various professionals.
Disadvantages of the investigator profession
Stress
High stress levels at work.
Irregular hours
Need to work on weekends.
Emotional burden
Dealing with tragic situations.
How to become a investigator
In the UK you can train as an investigating detective without a prior law degree. The standard route is to join a police force and qualify as a constable, then move into the Detective Constable role. A degree-level qualification is built into the training, so academic study and on-the-job learning go hand in hand.
1. Detective entry programme
Forces run a Detective Degree Holder Entry Programme (DHEP) and direct detective routes that combine paid work with study toward a degree-level qualification in professional policing. You investigate real cases from the start under supervision.
2. Police constable then CID
Many detectives first qualify as a constable through the Police Constable Degree Apprenticeship (PCDA) or the Police Constable Entry Programme, gain experience, then apply to the Criminal Investigation Department and pass the national investigators' exam.
3. On-the-job training and mentoring
Whichever entry route you take, investigative skill is built on the job: gathering evidence, interviewing witnesses and managing casework alongside experienced detectives, supported by accredited investigator training.
The fastest realistic route is a detective entry or constable apprenticeship programme that pays you while you train and earn a degree-level policing qualification. Standalone criminology courses are useful background but are not the route in — you train within a police force.