Detective Exam (NIE) Exam Study Guide (2026)
Everything the Detective Constable: National Investigators' Exam (NIE) tests, topic by topic: what each section covers, the facts that come up most, and how to study it. Pair it with the free 15-question practice test.
The exam at a glance
| Questions | 80 multiple-choice questions; 10 poorly performing questions are removed at marking, so you are scored on 70 |
|---|---|
| Time | 2 hours |
| Passing score | 55.7% (39 of the 70 scored questions). 85.7% or more earns an exceptional grade |
| Format | Syllabus is only the Blackstone's Police Investigators' Manual for the exam year (2027 edition for 2027 sittings), in four areas: general principles, police powers and procedures; serious crime and other offences; property offences; sexual offences. The College recommends at least 14 weeks of independent study. No help from others, no AI tools, no unauthorised devices |
| Certifying body | College of Policing (exam and PIP2 standards), with your force or organisation selecting candidates and running the PIP2 programme |
| Test provider | Online, unsupervised, on your own device or in a force testing room; register through your NIE liaison contact on the College's AIMS system. 2027 dates: 2 March, 8 June, 7 September and 16 November (8am to 8pm) |
Mind map: the whole exam on one screen
Read the complete Detective Exam (NIE) study notes for “The Trainee Investigator Route, PIP2 and the NIE”
Our first full set of comprehensive notes, about 11 minutes of reading: Where the NIE fits in PIP · Who can sit · How the 2027 exam runs · Resits and validity, a worked exam example, the traps examiners use and a one-minute recap. Create a free account to read it and see how premium notes work before you decide.
1. The Trainee Investigator Route, PIP2 and the NIE
Where the NIE fits in the Professionalising Investigations Programme, who can sit it, the 2027 dates and rules, scoring, validity and resits.
Key facts
- PIP has four levels: PIP1 (priority and volume crime), PIP2 (serious and complex crime, the detective level), PIP3 (major crime senior investigating officer) and PIP4 (strategic lead). The NIE is the gateway to PIP2.
- Open to warranted officers, police staff investigators and people in other investigative bodies selected as potential PIP2 students, who can show current PIP level 1 competence. Your force or organisation must evidence this.
- 2027 sittings: 2 March, 8 June, 7 September and 16 November, 8am to 8pm. Registration windows: 6 January to 3 February, 7 April to 12 May, 14 July to 11 August and 15 September to 20 October 2027 (6pm close; forces may close earlier).
- Format: one 80-question multiple-choice paper in 2 hours; 10 questions removed at marking, scored on 70. Pass 55.7% (39 of 70); exceptional 85.7%. Results within about three weeks.
- Syllabus: only the Blackstone's Police Investigators' Manual for the exam year (2027 edition for 2027), in four areas: general principles, police powers and procedures; serious crime and other offences; property offences; sexual offences.
- A pass is valid for three years less one day. Resits follow force policy; after a second fail a development meeting must be held, and after three fails the candidate and force should seriously consider whether the pathway is right at that time.
Flashcards
Exam tip: Ask your force about course places before you book a sitting. Validity is three years, and the College will not extend it because a development course was not available.
2. General Principles, Police Powers and Procedures
Syllabus area 1 (chapters 1.1 to 1.12): diversity, mens rea, actus reus, instituting proceedings, court procedure and witnesses, entry and search, detention, identification, interviews, bail, disclosure and RIPA.
Key facts
- Mens rea: intention includes oblique intent where death or serious harm is a virtual certainty and the defendant appreciates it (R v Woollin); recklessness is subjective (R v G).
- Entry and search: s.17 PACE (enter to arrest for an indictable offence, save life or limb, prevent serious damage); s.18 (after arrest for an indictable offence, with inspector's written authority unless s.18(5)); s.32 (premises where arrested or immediately before); s.8 warrants from a justice.
- Detention: reviews at 6 hours then every 9 hours; 24 hours without charge, 36 with a superintendent for indictable offences, 96 with warrants of further detention. Code C 12.2 requires 8 hours' continuous rest in any 24.
- Identification (Code D): where an eyewitness has identified or may identify a suspect who disputes it, hold an identification procedure (normally video) unless impracticable or of no useful purpose.
- Interviews (Codes C, E, F): caution before questioning about an offence; appropriate adults for under-18s and vulnerable people; audio recording under Code E, visual under Code F.
- Pre-charge bail: 3 months, extendable to 6 by an inspector, 9 by a superintendent and 12 by a commander or ACC in designated cases; then by a court.
Flashcards
Exam tip: Where the manual cites a PACE Code paragraph, the College expects you to know it. Keep a card per paragraph with its number and the rule in one line.
3. Serious Crime and Other Offences
Syllabus area 2 (chapters 2.1 to 2.14): homicide, drugs, firearms, terrorism, cybercrime, aggravated offences, assaults, harassment and stalking, domestic abuse, child protection, deprivation of liberty, orders, public order and standards of driving.
Key facts
- Murder: unlawful killing with intent to kill or cause GBH. Voluntary manslaughter through loss of control, diminished responsibility or suicide pact; involuntary manslaughter by unlawful act or gross negligence.
- Assaults: common assault and battery (s.39 CJA 1988); s.47 ABH; s.20 wounding or inflicting GBH (foresight of some harm); s.18 with intent. Non-fatal strangulation or suffocation is a separate offence (s.75A Serious Crime Act 2015).
- Drugs (Misuse of Drugs Act 1971): possession (s.5(2)), possession with intent to supply (s.5(3)), supply or offering to supply (s.4(3)). Nitrous oxide has been Class C since 8 November 2023.
- Harassment and stalking (Protection from Harassment Act 1997): a course of conduct means conduct on at least two occasions; stalking offences in ss.2A and 4A.
- Controlling or coercive behaviour (s.76 Serious Crime Act 2015) covers personally connected people whether or not they live together (since 5 April 2023).
- Racially or religiously aggravated offences (Crime and Disorder Act 1998): hostility shown at the time, or motivation by hostility, based on membership of a racial or religious group.
Flashcards
Exam tip: Serious crime questions often hinge on the mental element. Before reading the options, decide what the defendant intended or foresaw.
Test yourself on these topics
Take the free 15-question Detective Exam (NIE) test, then save your results to unlock your Readiness Score and the mistakes bank.
4. Property Offences
Syllabus area 3 (chapters 3.1 to 3.9): theft, robbery, blackmail, burglary, aggravated burglary, handling, fraud, proceeds of crime and criminal damage.
Key facts
- Theft (ss.1-6 Theft Act 1968): dishonest appropriation of property belonging to another with intent to permanently deprive. Wild mushrooms, flowers, fruit and foliage are not stolen unless picked for reward, sale or other commercial purpose (s.4(3)).
- Robbery (s.8): stealing with force (or putting or seeking to put someone in fear of force) immediately before or at the time, in order to steal. Wrenching a bag from a grip can be force (R v Clouden).
Flashcards
Exam tip: Build a timing table for the Theft Act: when must intent exist, when must force be used, when must the weapon be carried. Timing is the most tested point.
5. Sexual Offences
Syllabus area 4 (chapters 4.1 to 4.8): consent, rape, sexual assault, offences against children and people with a mental disorder, preparatory offences, prostitution-related and other sexual offences.
Key facts
- Rape (s.1 Sexual Offences Act 2003): intentional penetration of the vagina, anus or mouth with the penis, without consent and without reasonable belief in consent.
- Consent (s.74): agreeing by choice, having the freedom and capacity to make that choice. Whether a belief is reasonable is judged having regard to all the circumstances, including steps taken to ascertain consent.
Flashcards
Exam tip: Make a three-column table for each offence: what act, which age or capacity condition, and what mental element. Many options differ in only one of these.
6. Investigation Practice: Interviews, Disclosure and Covert Powers
The working knowledge a PIP2 investigator needs and the NIE tests within area 1: investigative interviewing, disclosure under the CPIA, and covert powers under RIPA 2000.
Key facts
- Investigative interviewing follows the PEACE model: Planning and preparation, Engage and explain, Account clarification and challenge, Closure, Evaluation.
- Before interview, consider disclosure to the solicitor, the suspect's fitness, need for an appropriate adult or interpreter, and special warnings under ss.36-37 Criminal Justice and Public Order Act 1994 for objects, marks or presence at a scene.
Flashcards
Exam tip: Disclosure failures have collapsed real trials. Treat every 'should the officer record this?' question as a yes unless the material is clearly irrelevant.
7. Detective Selection Interview and Development Programme
How forces select trainee detectives and what PIP2 involves after the NIE: selection interviews against the CVF, the development course and the work-based portfolio.
Key facts
- Forces select trainee investigators locally: commonly an expression of interest or application, a competency-based interview against the CVF, and support from your line manager. Some forces also recruit detectives directly through a detective entry route.
- Interview questions often cover: why you want to investigate serious crime; a complex case you handled and how you kept an investigative mindset; how you managed competing priorities; a time you supported a vulnerable victim or witness; how you handled a mistake or challenge.
Flashcards
Exam tip: Prepare one example where evidence did not support your first theory and you changed direction. It shows the open-minded, analytical approach detective boards look for.
8. Study Plan and Timeline
A 14-week plan across the four syllabus areas, official resources, and what to do on exam day.
Key facts
- Weeks 1-3: general principles, powers and procedures (the largest area, including PACE Codes). Weeks 4-6: serious crime. Weeks 7-9: property offences. Weeks 10-11: sexual offences. Weeks 12-14: mixed timed practice and weak areas.
- The blueprint comes from a national survey of investigators, so frequently encountered topics get more questions, but any part of the syllabus can be tested.
Flashcards
Exam tip: Study in short daily blocks with self-testing rather than long weekend sessions. Little and often fits shift work and beats rereading for long-term recall.
How to pass
- 80 questions in 120 minutes is 90 seconds each. Read the last line of the question first so you know whether it asks for the offence, the power or the defence before you read the scenario.
- Property and sexual offences are two of the four syllabus areas. Learn the definitions in the Theft Act 1968, Fraud Act 2006 and Sexual Offences Act 2003 exactly, including the evidential and conclusive presumptions on consent.
- Where the manual refers to a PACE Code paragraph (Codes C, D and E especially) you are expected to know it. Make a card for each one the manual cites.
- Start at least 14 weeks before your sitting, as the College recommends, and study the edition for your exam year: the 2027 manual for every 2027 sitting.
Frequently asked questions
How long should I study for the Detective Exam (NIE) exam?
Most working candidates need 4 to 8 weeks at 45 to 60 minutes a day. Book your exam once your Readiness Score has stayed at 80 or higher for about a week.
Can I take the Detective Exam (NIE) exam online?
Yes. The College of Policing runs its sergeants', inspectors' and investigators' exams online, and you sit them on a set exam day through a link your force examinations officer arranges. Registration goes through your force, not directly.
What score do I need to pass the Detective Exam (NIE) exam?
55.7% (39 of the 70 scored questions). 85.7% or more earns an exceptional grade. The exam has 80 multiple-choice questions; 10 poorly performing questions are removed at marking, so you are scored on 70 and a time limit of 2 hours.
What are the most tested topics?
The outline covers the trainee investigator route, pip2 and the nie, general principles, police powers and procedures, serious crime and other offences, property offences, sexual offences, investigation practice: interviews, disclosure and covert powers, detective selection interview and development programme, study plan and timeline. Use the free practice test to see which ones you need most.
The premium Detective Exam (NIE) study path
Premium Detective Exam (NIE) prep is studied one topic at a time. Each step starts with that topic's key notes and flashcard deck, then its own question sets of 25, so you master one topic before you move to the next. When every topic is strong, the 6 full mock exams show you're ready.
Your step-by-step study path
- 1The Trainee Investigator Route, PIP2 and the NIE8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Notes free with an account
- 2General Principles, Police Powers and Procedures8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 3Serious Crime and Other Offences8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 4Property Offences8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 5Sexual Offences7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 6Investigation Practice: Interviews, Disclosure and Covert Powers7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 7Detective Selection Interview and Development Programme7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- 8Study Plan and Timeline7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25Premium
- Final step: 6 full mock exams80 questions each, timed like test day. Pass them, then book your exam.Premium
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Summarized from recruiting organisations' official candidate information and the rules cited, checked November 2026. Confirm current requirements with College of Policing (exam and PIP2 standards), with your force or organisation selecting candidates and running the PIP2 programme.