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Professional negligence in forensic investigations

ICAN Skills, Audit, Assurance and Forensics. Syllabus area D, forensic accounting services

8 min read · Updated 6 November 2026

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In this part

A forensic firm is hired to find out who has been stealing from a client. The team starts the work without a plan, loses a key laptop's log by letting the client's staff keep using it. Reports a loss figure that is later shown to be wrong. The client's lawyers cannot use the evidence, the thief goes free and the client sues the firm.

Forensic work has high stakes, so its practitioners owe a high standard of care, and failure has serious legal and professional consequences.

This topic covers the meaning of professional negligence, its four elements, the ways it can occur in a forensic investigation (planning and resources, evidence and reporting), other failings, the consequences and how firms reduce the risk. The previous topics covered the techniques of forensic work, and the next covers the expert report.

In 30 seconds

Negligence: failing to meet the standard of care expected of a professional, with harm resulting. Elements: duty of care, breach, causation, damages. In forensic work:

  • investigation negligence (poor planning, lack of skill, insufficient resources)
  • evidence negligence (contamination, inadequate collection and analysis)
  • reporting negligence (incomplete, inaccurate or late reports, poor documentation, poor communication)
  • conflicts of interest, bias and failure to follow procedures

Consequences: loss of credibility, financial loss, professional sanction, miscarriage of justice, stress. Reduce risk: training, risk assessment, peer review, procedures, quality management, monitoring.

Key terms in plain English

TermWhat it means
NegligenceFailure to meet the standard of care expected
Duty of careAn obligation to take reasonable care
BreachFailure to meet that duty
CausationThe link between the breach and the harm
Chain of custodyThe record of who handled evidence
Peer reviewReview of work by another firm or practitioner

Syllabus check

This topic is in syllabus area D, forensic accounting services (15% of marks). It covers:

  • professional negligence in forensic investigations
  • the elements and consequences of negligence
  • ways to reduce professional negligence

CAMA 2020 and professional negligence

The Companies and Allied Matters Act 2020 (CAMA 2020) is the company law of Nigeria. The sections below apply to this topic.

SectionWhat it saysLink to this topic
s. 404(2)The auditor reports on the accounts and the booksStandards of care apply to the report
s. 407(3)Right of access to books, accounts and vouchers and to informationAccess does not remove the duty of care
s. 404(7)Audit committee functionsThe committee oversees investigations by internal audit

The rules in more depth

What professional negligence is

Negligence occurs when a professional fails to meet professional standards of care, or to give the attention expected, leading to errors or omissions that compromise the integrity of evidence, an investigation or court proceedings in the service given to a client.

It can also be seen as causing injury to a person or damage to property by an act, or by failing to act with regard for the safety and rights of others. For a forensic practitioner, the standard is that of a reasonably skilled and careful practitioner in the same field, in the same circumstances, as a doctor to a patient.

Elements of negligence

ElementMeaning in a forensic engagement
Duty of careThe accountant owes a duty to the client, as a doctor owes one to a patient. It arises once the firm accepts the engagement
Breach of dutyThe accountant fails to meet the standard of care expected
CausationThe breach caused the harm to the client
DamagesThe client suffered financial or other loss as a result

All four must be shown. A mistake that causes no loss gives no claim for damages, though it may still lead to disciplinary action. Similarly, a loss that would have occurred even with perfect work is not caused by the breach.

Incidence of negligence in a forensic investigation

(a) Investigation-related negligence

  • Inadequate planning: not preparing a comprehensive plan for the assignment. Without a plan, evidence is overlooked or the deadline is missed.
  • Lack of experience or skill: professional due care is breached when a practitioner takes on work for which he lacks the skill or training. An accountant should decline an assignment that he is not competent to do.
  • Insufficient resources: the firm lacks the time, budget or personnel for the work. Timing, budget and staff are crucial to preventing negligence.

(b) Evidence-related negligence. The evidence must be able to prove or disprove the allegation. Negligence arises through:

  • contamination of evidence: where evidence is not properly handled, stored or transmitted, for example a device is used after seizure, a document is marked, or the chain of custody is not kept; and
  • inadequate collection and analysis: physical, digital and testimonial evidence must be relevant, reliable and sufficient. Failure to analyse it properly, or misinterpreting or misrepresenting it, may be negligence.

(c) Reporting-related negligence. The investigator must report at the end. Negligence can occur where:

  • the report is incomplete, inaccurate or late, leading to misinformed decisions;
  • findings are not documented, including the working papers, conclusions, recommendations and supporting evidence; or
  • findings and recommendations are not adequately communicated to the relevant stakeholders.

Other forms of negligence:

  • Conflict of interest, which compromises the integrity of the investigation.
  • Lack of objectivity: allowing bias and prejudice to influence findings and recommendations.
  • Failure to follow procedures, protocols or standards.

Consequences of professional negligence

  • Loss of credibility and damage to the firm's reputation.
  • Financial consequences: damages payable to the client and the cost of defending a claim, as well as lost fees.
  • Professional sanction: disciplinary action against the firm, such as withdrawal of licence or suspension from taking forensic engagements, depending on how serious the negligence is.
  • Miscarriage of justice: the party who behaved unethically may be found not guilty because of faulty work, or an innocent person may be blamed.
  • Stress: emotional stress or harm to the client.

In Nigeria, the professional accountant may face a complaint before the Institute's disciplinary bodies, such as the Investigating Panel and Disciplinary Committee, and in serious cases the regulatory powers of the Financial Reporting Council of Nigeria may apply. The client may also sue in the courts for breach of contract and in negligence.

Mitigating professional negligence

  • Continuous training and education for all staff, especially on new developments in forensics.
  • Risk assessment of each engagement, with procedures for responding to the risks identified.
  • Peer review among firms on forensic engagements, to identify and deal with errors and reliability issues.
  • Developing and following procedures, updated for new developments such as computer forensics.
  • Periodic, at least annual, quality management assurance on forensic engagements.
  • Monitoring and evaluation of the investigation process, to find areas for improvement.

Other protections are a clear engagement letter that sets out the scope, limits and the use of the report; a limit of liability where the law allows; professional indemnity insurance; supervision and review of work by a partner; documentation of key decisions and instructions from the client; and refusing work outside the firm's competence.

Applying the rules to a scenario

In the exam, apply the four elements to the facts, and name the type of negligence. Suppose a firm agreed to trace stolen funds but did not interview the finance team, did not secure the accounting server and reported a loss that turned out to be ₦20 million too high. The duty arose when the firm accepted the work. The breach is poor planning and inadequate evidence collection and analysis.

Causation exists if the client acted on the figure, for example by suing for too much and losing costs. The damage is the costs and lost recovery. The firm should have planned, secured the evidence, reviewed the work and checked the figure.

A defence may be available if the firm acted in line with accepted professional practice, if the client's own conduct caused the loss, or if the loss was too remote or the claim was made after the time allowed by law.

Worked examples

Example 1: skill. A firm of general practitioners takes on a complex cryptocurrency tracing job with no trained staff.

  1. The firm lacks the skill: a breach of professional competence and due care.
  2. It should have declined, or hired a specialist.

Example 2: contamination. The firm leaves the suspect's laptop on a desk for a week, and staff use it.

  1. Evidence is contaminated.
  2. The court may reject the evidence and the client's case may fail.

Example 3: late report. The report is delivered after the date of the hearing, so the case goes ahead without it.

  1. Reporting-related negligence: not timely.
  2. The client may claim for the loss that followed.

Example 4: no loss. A working paper was not signed, but the evidence and the report were correct and the case succeeded.

  1. A breach occurred, but there is no damage.
  2. There may be no negligence claim, but the firm's quality system should deal with the lapse.

How to score full marks

  • Define negligence and list the four elements.
  • Group the ways it occurs into investigation, evidence, reporting and other.
  • Give consequences and ways to reduce the risk.
  • Apply the elements to the facts of the question.

Common mistakes in the exam

  • Forgetting causation and damages.
  • Listing negligence types without examples.
  • Leaving out conflicts of interest and objectivity.
  • Giving remedies but no consequences.

Quick revision

  • Duty, breach, causation, damages.
  • Investigation, evidence, reporting and other negligence.
  • Credibility, money, sanction, justice, stress.
  • Training, risk, peer review, procedures, quality, monitoring.

Practice questions

Questions 1 to 10 are multiple choice. Questions 11 to 13 are written. Try each before opening the answer.

Question 1. The first element of negligence is:

  1. Duty of care
  2. Damages
  3. Causation
  4. Fees
Show the answer

A. Followed by breach, causation and damages.

Question 2. Breach of duty means the accountant:

  1. Failed to meet the expected standard of care
  2. Was paid
  3. Won the case
  4. Hired staff
Show the answer

A. The second element.

Question 3. Contamination of evidence is:

  1. Evidence-related negligence
  2. Reporting negligence
  3. Tax risk
  4. Planning
Show the answer

A. Poor handling or storage.

Question 4. An incomplete or late report is:

  1. Reporting-related negligence
  2. Planning negligence
  3. Skill negligence
  4. No negligence
Show the answer

A. Leads to misinformed decisions.

Question 5. Taking an assignment without the skill is a breach of:

  1. Professional competence and due care
  2. Confidentiality
  3. Fees
  4. Tax
Show the answer

A. A fundamental principle.

Question 6. One consequence of negligence is:

  1. Professional sanction
  2. A higher fee
  3. Automatic success
  4. No effect
Show the answer

A. Such as licence withdrawal.

Question 7. Which reduces the risk of negligence?

  1. Peer review
  2. Hiding errors
  3. Cutting training
  4. Ignoring procedures
Show the answer

A. Also training and monitoring.

Question 8. Causation means the breach:

  1. Caused the harm
  2. Was paid for
  3. Was reported
  4. Was audited
Show the answer

A. A required element.

Question 9. A conflict of interest compromises:

  1. The integrity of the investigation
  2. The fee
  3. The venue
  4. The audit period
Show the answer

A. Another form of negligence.

Question 10. Failure to document findings is:

  1. Reporting-related negligence
  2. Not negligence
  3. Evidence contamination
  4. A tax issue
Show the answer

A. Poor documentation.

Question 11 (10 marks). Define professional negligence and explain the ways it may arise in a forensic investigation. (10 marks)

Question 12 (10 marks). Explain the consequences of professional negligence and how a forensic firm may reduce it. (6 marks)

Question 13 (10 marks). A forensic firm failed to secure a computer that was evidence and delivered its report late. Explain whether the firm may be liable in negligence. (4 marks)

Model answers

Show the model answer to Question 11

Definition: failing to comply with professional standards of care, leading to errors or omissions that compromise evidence, the investigation or proceedings; duty, breach, causation, damages. (3) Ways: planning, skill, resources; contamination and inadequate evidence analysis; incomplete, inaccurate or late reports; conflicts, objectivity, procedures. (7)

Show the model answer to Question 12

Consequences: credibility, financial loss, sanction, miscarriage of justice, stress. (3) Reduction: training, risk assessment, peer review, procedures, quality management, monitoring. (3)

Show the model answer to Question 13

Duty arose on accepting the engagement; breach by contaminating evidence and late reporting; liable if the breach caused loss, such as the failure of the case, and damages can be shown. (4)

Pathfinder on Professional negligence in forensic investigations

These are the ICAN Pathfinder questions that test this topic. ICAN owns the questions and the suggested solutions, so we point you to them and do not copy them. Open your Pathfinder, attempt each question under exam conditions, then check your answer against the notes above.

Source: ICAN Pathfinder, Audit, Assurance and Forensics. Diets covered: May 2026 and November 2025.

Spotted a mistake? Tell us and we will check it.

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All Audit, Assurance and Forensics topics

You are reading topic 66 of 67.

  1. Meaning and objectives of audit, the need for audit and types of audit01
  2. Assurance engagements, levels of assurance and sustainability assurance02
  3. Statutory audit and the legal framework: CAMA 2020 and the FRC Act03
  4. International standards on auditing, assurance engagements and Nigerian standards04
  5. Obtaining and accepting a new audit engagement05
  6. Engagement letters: agreeing the terms of an audit engagement (ISA 210)06
  7. Fundamental ethical principles and the conceptual framework07
  8. Independence, objectivity and integrity of the auditor08
  9. Confidentiality in audit and assurance engagements09
  10. Conflicts of interest and resolving ethical conflicts10
  11. Non-compliance with laws and regulations (NOCLAR) and whistleblowing11
  12. Public interest and professional scepticism in audit and assurance12
  13. Rules-based and principles-based ethics, and ethics in governance13
  14. Internal audit: concept, role and its place in internal control14
  15. Internal audit compared with external audit15
  16. Operational and other internal audit assignments16
  17. Internal audit reports, regulation, ethics and outsourcing17
  18. Planning an audit (ISA 300)18
  19. Understanding the entity, its environment and its laws (ISA 315 and ISA 250)19
  20. Materiality in planning and performing an audit (ISA 320)20
  21. Audit risk and the auditor\u2019s response to assessed risks (ISA 330)21
  22. Fraud and the auditor (ISA 240)22
  23. Audit of not-for-profit organisations23
  24. Public sector audit24
  25. Audit evidence (ISA 500)25
  26. Audit documentation and working papers (ISA 230)26
  27. Audit sampling (ISA 530)27
  28. Importance, objectives and types of internal control28
  29. Control environment, the risk assessment process and monitoring of controls29
  30. Control activities and IT controls30
  31. Limitations of internal control and recording control systems31
  32. Evaluating controls and assessing audit risk32
  33. Risks of specialised IT systems and information security measures33
  34. Tests of controls and the main transaction cycles34
  35. The sales system: controls and tests of controls35
  36. The purchases and expenses system: controls and tests of controls36
  37. The payroll system: controls and tests of controls37
  38. The bank and cash system: controls and tests of controls38
  39. The inventory and non-current asset systems: controls and tests of controls39
  40. Management letters and reporting control deficiencies40
  41. Substantive procedures: role and approach41
  42. Analytical procedures (ISA 520)42
  43. Audit of tangible non-current assets43
  44. Audit of intangible non-current assets44
  45. Inventory: valuation and the physical count (ISA 501)45
  46. Trade receivables, prepayments and external confirmations (ISA 505)46
  47. Substantive procedures on bank and cash balances47
  48. Trade payables, accruals, provisions and contingencies48
  49. Non-current liabilities, equity and directors\u2019 emoluments49
  50. Key income statement figures50
  51. Written representations (ISA 580)51
  52. Evaluating misstatements (ISA 450) and the overall review of the financial statements52
  53. Purpose of the auditor\u2019s report and the audit expectation gap53
  54. The unmodified auditor\u2019s report (ISA 700)54
  55. Key audit matters (ISA 701) and reports prescribed by law55
  56. Audit reporting under CAMA 2020 and the audit committee56
  57. Going concern (ISA 570)57
  58. Modified opinions, emphasis of matter and other matter paragraphs58
  59. Information systems audit: risks, protection and the audit process59
  60. Vulnerability audit, data centre audit, banking transactions and IT audit reports60
  61. Data analytics, artificial intelligence, blockchain and other audit technology61
  62. Nature, objectives and types of forensic accounting services62
  63. Economic damage through contract and tort63
  64. Computer forensics, fraud investigation and litigation support64
  65. Hidden assets: how forensic accountants find them65
  66. Professional negligence in forensic investigations66 here
  67. The expert report and reporting in forensic engagements67
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