Defence of Due Diligence

Introduction

The defence of due diligence is a legal defence available in certain civil and statutory claims where a person or organisation shows that it took reasonable care, precautions, and steps to prevent the wrongful act or harm. The defence is based on the principle that liability should not always arise merely because harm occurred; the law may excuse a defendant who can establish that it acted with the level of care reasonably expected in the circumstances.

Due diligence generally requires an assessment of what a reasonable person or organisation would have done in similar circumstances. The exact scope of the defence depends upon the relevant statute, contractual relationship, or area of law.

Meaning of Due Diligence

"Due diligence" means the reasonable care and attention that a person is expected to exercise in a particular situation.

It may include:

• Making reasonable inquiries before taking an action.
• Checking facts and documents.
• Following applicable laws and regulations.
• Maintaining appropriate systems and procedures.
• Monitoring employees, agents, or contractors where necessary.
• Taking preventive measures against foreseeable harm.
• Responding promptly when a problem is discovered.
• Keeping appropriate records showing the precautions taken.

The standard is generally one of reasonableness, rather than absolute perfection.

Due Diligence as a Defence

A defendant relying upon due diligence generally argues:

Although the alleged harm or violation occurred, the defendant exercised all reasonable care and took reasonable precautions to prevent it.

For example, an employer may have compliance procedures, employee training, supervision and reporting mechanisms. If an employee nevertheless commits an unlawful act contrary to those systems, the employer may attempt to rely on a statutory due-diligence defence where the applicable law permits it.

However, mere existence of a policy is not necessarily sufficient. Courts may examine whether the policy was actually implemented and monitored.

Essential Elements of the Defence

1. Reasonable precautions

The defendant must show that it took reasonable precautions against the relevant risk.

The precautions should correspond to the seriousness and foreseeability of the risk.

2. Reasonable system of control

Where the defendant operates a business or organisation, it may need to demonstrate that it had an effective system for preventing violations.

This can include:

• compliance policies;
• employee training;
• supervision;
• internal audits;
• monitoring;
• reporting procedures; and
• disciplinary mechanisms.

3. Reasonable implementation

Having written procedures alone may not establish due diligence.

The defendant should demonstrate that the procedures were actually followed and enforced.

4. Absence of negligence

Due diligence is closely connected with the absence of negligence. If the defendant ignored an obvious risk or failed to take reasonable precautions, the defence is unlikely to succeed.

5. Prompt corrective action

Where a problem becomes known, prompt action may support the defence.

For example, an organisation that discovers a compliance failure may immediately investigate, stop the unlawful conduct, preserve evidence and take corrective measures.

6. Evidence of compliance

Documents can be particularly important. Examples include:

• training records;
• inspection reports;
• audit records;
• emails;
• risk assessments;
• compliance certificates;
• employee instructions;
• monitoring records; and
• investigation reports.

Important Case Laws

1. Morris v. CW Martin & Sons Ltd. (1966)

In this English case, an employee of a furrier stole a customer's fur. The employer was held responsible for the employee's wrongful conduct.

The case demonstrates that an employer cannot simply rely upon the fact that it did not personally commit the wrongful act. Where responsibility is imposed by law, the employer may need to establish appropriate safeguards and supervision.

Principle: An organisation's responsibility may extend to wrongful conduct occurring within its business, and reasonable systems of supervision can become important when liability is assessed.

2. Tesco Supermarkets Ltd. v. Nattrass (1972)

The House of Lords considered whether a supermarket could be liable for a discriminatory pricing offence committed by an employee.

Tesco had established a system intended to prevent such violations. The House of Lords ultimately treated the particular employee as a subordinate employee rather than the company's controlling mind.

Principle: A company may distinguish between the conduct of ordinary employees and the conduct of those who represent its directing mind and will. Proper compliance systems may therefore be highly relevant in determining corporate responsibility.

3. Meridian Global Funds Management Asia Ltd. v. Securities Commission (1995)

The Privy Council considered corporate attribution and whether the knowledge and actions of employees could be attributed to a company for statutory purposes.

The case established that attribution depends upon the purpose and wording of the relevant legal rule, rather than simply applying one universal test.

Principle: In statutory liability cases, courts examine the purpose of the statute and the role performed by the relevant person. This is important when determining whether an organisation can rely upon its internal compliance arrangements.

4. Caparo Industries plc v. Dickman (1990)

The House of Lords developed the modern approach to determining whether a duty of care exists in negligence.

The court emphasised factors including:

• foreseeability;
• proximity; and
• whether it is fair, just and reasonable to impose a duty.

Principle: The existence and scope of reasonable care depend upon the circumstances and the relationship between the parties. Due diligence therefore cannot be judged according to an identical standard in every situation.

5. Donoghue v. Stevenson (1932)

This landmark case established the modern neighbour principle in negligence. Manufacturers were required to take reasonable care toward persons who could reasonably be affected by their conduct.

Principle: A person or business must take reasonable precautions against reasonably foreseeable harm to persons who may be affected by its activities.

This principle forms an important foundation for understanding why due diligence focuses on foreseeable risks and reasonable precautions.

6. Bolton v. Stone (1951)

A cricket ball was hit out of a cricket ground and injured a person on a nearby road. The House of Lords considered the likelihood of the risk.

The court found that the probability of such an accident was extremely small and concluded that negligence had not been established.

Principle: Reasonable care does not require eliminating every theoretical risk. The seriousness and probability of the risk are relevant when deciding what precautions are reasonably required.

7. Latimer v. AEC Ltd. (1953)

A factory floor became slippery after flooding. The employer placed sawdust on the floor but did not completely close the factory.

The House of Lords held that the employer had taken reasonable precautions and was not negligent merely because it had not eliminated the risk completely.

Principle: Due diligence requires reasonable precautions, not absolute prevention of every possible accident.

This is one of the clearest authorities supporting the concept that reasonable care does not mean perfection.

8. Indian Council for Enviro-Legal Action v. Union of India (1996)

The Supreme Court of India dealt with serious environmental pollution caused by industrial activities and applied strong principles concerning responsibility for environmental harm.

The judgment emphasised that industries dealing with hazardous substances have significant responsibilities toward the environment and affected communities.

Principle: Where activities create significant risks, the standard of responsibility and preventive measures becomes correspondingly important. Due diligence must be assessed in light of the nature and seriousness of the risk.

9. M.C. Mehta v. Union of India (Oleum Gas Leak Case) (1987)

The Supreme Court of India developed the principle of absolute liability for enterprises engaged in hazardous or inherently dangerous activities.

Unlike ordinary negligence, absolute liability does not permit the enterprise to escape liability merely by demonstrating that it exercised reasonable care.

Principle: The availability of a due-diligence defence depends heavily upon the applicable legal rule. Where the law imposes absolute liability, ordinary reasonable-care arguments cannot ordinarily defeat liability.

Limitations of the Defence

Due diligence is not a universal defence.

Its availability depends upon the particular legal provision.

For example, where a statute expressly provides that a person is liable only if negligence or lack of reasonable precautions is established, due diligence may be highly relevant. Conversely, where the statute creates strict or absolute liability, showing reasonable care may not be sufficient.

The defence may also fail where:

• the defendant knew about the risk but did nothing;
• precautions were merely theoretical;
• employees were inadequately trained;
• monitoring was ineffective;
• warnings were ignored;
• records were fabricated or incomplete;
• the risk was reasonably foreseeable; or
• the defendant's conduct fell below the applicable statutory standard.

Due Diligence and Strict Liability

It is important to distinguish due diligence from strict liability.

Under ordinary negligence principles, proving that the defendant exercised reasonable care may help establish that there was no negligence.

Under strict liability, liability may arise even without proof of negligence.

Under absolute liability, particularly in certain hazardous-activity contexts, the defendant may not be able to rely on reasonable-care precautions as a defence.

Therefore:

Negligence → reasonable care is central.
Strict liability → reasonable care may not be a complete defence.
Absolute liability → due diligence generally cannot eliminate the liability imposed by the rule.

Burden of Proof

The burden depends upon the applicable law.

Where a statute expressly creates a due-diligence defence, the defendant may be required to establish that it exercised due diligence or took all reasonable precautions.

Courts may consider:

1. What risk existed?
2. Was the risk foreseeable?
3. What precautions were reasonably available?
4. Were those precautions actually implemented?
5. Were employees properly instructed?
6. Was compliance monitored?
7. Was the system reviewed and updated?
8. What action was taken after the problem was discovered?

Practical Example

Suppose a company is accused of violating an employment-related statutory requirement because an employee improperly handled confidential employee information.

The company may seek to demonstrate due diligence by showing that it:

• had a written data-protection policy;
• trained employees;
• restricted access to sensitive information;
• used password protection;
• conducted periodic audits;
• monitored access;
• warned employees about unauthorised disclosure;
• investigated the incident immediately; and
• took corrective and disciplinary action.

The court would then consider whether these measures were reasonable and genuinely implemented, rather than merely whether a policy existed on paper.

Importance of Due Diligence in Corporate and Employment Law

Due diligence is particularly important for organisations because employers and companies operate through employees, agents and systems.

An effective due-diligence programme can include:

Risk identification → Policy creation → Employee training → Monitoring → Auditing → Investigation → Corrective action

Such a system helps demonstrate that the organisation did not simply ignore foreseeable risks.

Conclusion

The defence of due diligence is founded on the principle of reasonable care. A defendant seeking to rely upon it generally needs to demonstrate that it identified relevant risks and took reasonable, practical and effective measures to prevent the unlawful act or harm.

The defence does not require absolute perfection. Cases such as Latimer v. AEC Ltd. demonstrate that the law generally asks whether reasonable precautions were taken in the circumstances. At the same time, M.C. Mehta v. Union of India illustrates the important limitation that where the law imposes absolute liability, ordinary due diligence cannot be used to escape that liability.

Thus, due diligence is best understood not as a guarantee against every harmful event, but as a demonstration of responsible, reasonable and adequately implemented preventive conduct.