Introduction

1. What are general defences in criminal law?

In criminal law, an accused person is not automatically guilty simply because they committed a harmful act. The law looks beyond the act itself and asks whether the person had the required mental element, known as mens rea, and whether they were in a position to make a free and rational choice. General defences are those circumstances recognised by law in which an accused can escape criminal liability because one or both of these elements are absent.

The Pakistan Penal Code 1860 contains a comprehensive set of general defences spread across several sections. These defences reflect a fundamental principle of criminal justice: that punishment is justified only where there is both a guilty act and a guilty mind. Where the accused acted out of necessity, compulsion, mistake, lack of mental capacity, or in defence of themselves or their property, the law offers protection from criminal punishment.

2. Defence of minority — Sections 82 and 83

The law treats children differently from adults because of their limited capacity to understand the consequences of their actions. Under Section 82, a child below seven years of age is completely exempt from criminal liability. This principle is expressed in the Latin maxim doli incapax, meaning incapable of committing a crime. The law conclusively presumes that a child below this age cannot distinguish between right and wrong.

Section 83 deals with children between seven and twelve years of age. For this age group, the exemption is not automatic. The defence applies only if the child had not yet attained sufficient maturity of understanding to appreciate the nature and consequences of the act. The burden of proving this lack of maturity falls on the accused.

There is one important limitation to these exemptions. They do not extend to offences under special or local laws where mens rea is not an essential ingredient, such as certain offences under public health legislation. A child can also be used as an innocent agent by an adult to commit a crime. In that case, the child remains exempt but the adult who used the child bears full criminal responsibility.

3. Defence of insanity — Section 84

Insanity is a complete defence to any criminal charge under Section 84 of the PPC. The underlying logic is sound: a person who does not understand what they are doing, or does not know that what they are doing is wrong, lacks the guilty mind that criminal punishment requires. As the law has long recognised, it is unjust to punish a person for their madness.

Essentials of the defence of insanity

Three conditions must be satisfied for the defence to succeed. First, the accused must have been suffering from unsoundness of mind at the exact time the act was committed. Past or subsequent insanity is not enough. Second, the unsoundness of mind must have caused a defect of reason, meaning the accused’s reasoning faculty must have been impaired, not merely their emotions. If only the emotions are affected while reasoning remains intact, the defence fails. Third, as a result of this unsoundness, the accused must have been incapable of knowing either the nature of the act or that it was wrong or contrary to law.

The burden of proving insanity lies on the accused. Courts apply what is known as the two-fold test: the accused must show both a disease of reason and that the disease prevented them from understanding the wrongfulness of their act.

Insanity caused by voluntary intoxication

Where a person becomes temporarily insane as a result of voluntary intoxication, this does not qualify as a defence under Section 84. Voluntary intoxication is treated separately and is generally not a defence in criminal law. Only genuine unsoundness of mind unrelated to voluntary intoxication can give rise to this defence.

4. Defence of intoxication — Sections 85 and 86

The law draws a sharp distinction between voluntary and involuntary intoxication. Voluntary intoxication is not a defence. A person who chooses to drink or consume intoxicants is presumed to have the same knowledge they would have had if sober. They cannot escape liability by pleading that their intoxication prevented them from understanding what they were doing.

Involuntary intoxication, on the other hand, is a complete defence. If the intoxicating substance was administered to the accused without their knowledge or against their will, and this rendered them incapable of knowing the nature of their act, they are protected under Section 85. Whether intoxication was voluntary or involuntary is a question of fact determined by the court based on the specific circumstances of each case.

Section 86 addresses the situation where an offence requires a particular intent or knowledge and the accused was voluntarily intoxicated at the time. In such cases, the court attributes to the accused the same knowledge they would have had if sober. However, the question of specific intent is still open for consideration, and voluntary drunkenness may be relevant evidence on the issue of whether that specific intent was actually formed.

5. Defence of mistake of fact — Sections 76 and 79

The defence of mistake of fact is available where a person commits an act under a genuine and reasonable belief in the existence of certain facts which, if true, would have made the act lawful. This defence rests on the absence of mens rea: a person who acts on an honest and reasonable mistake cannot be said to have a guilty mind.

Several conditions must be satisfied. The accused must have acted in good faith, meaning with due care and attention. The mistake must relate to facts, not law. Ignorance of the law is not a defence, though it may be considered in mitigation of punishment. The mistake must also be both honest and reasonable, judged by the standard of what a reasonable person in the same situation would have believed. If the accused was fully aware of all the relevant facts at the time, no mistake of fact can be pleaded regardless of any error in judgment about the legal consequences.

6. Defence of necessity and compulsion

Defence of necessity — Section 81

Section 81 recognises that sometimes a person must choose between two harmful outcomes and picks the lesser evil. Where an act that would otherwise be criminal is done in good faith and without criminal intent to prevent a greater harm to persons or property, it is excused. The act must be necessary, reasonable in the circumstances, and performed without any criminal intention. Whether the necessity was genuine and sufficient to justify the act is always a question of fact.

Defence of compulsion — Section 94

Compulsion under Section 94 is available as a defence where the accused acted under a threat of instant death. The threat must be immediate and real, not vague or relating to some future harm. A mere threat of harm short of instant death is insufficient. Two important limitations apply. First, the defence does not extend to murder or offences against the state punishable with death. The law holds that no person has the right to take another’s life to save their own. Second, the accused must not have voluntarily placed themselves in the situation that gave rise to the threat.

7. Defence of consent — Sections 87 to 92

Consent in criminal law means a free and voluntary agreement given by a rational and sober person who is capable of forming a proper judgment about the matter. Consent obtained through force, fraud, or threats of any kind is not valid in law.

Section 87 covers situations arising in lawful sports such as boxing, wrestling, or football. Hurt caused during a lawful game played according to its rules is justified even if serious. If a player unintentionally causes the death of another during such a game, they are not criminally liable. The game must be lawful and the rules must be followed for this protection to apply.

Under Section 88, unintentional grievous hurt or death caused in good faith and for the benefit of the injured person is justifiable where consent has been obtained. This provision is most relevant in medical and surgical contexts. Section 89 extends this to cases involving children under twelve years of age or persons of unsound mind, where consent can be given by a guardian, provided the act is done in good faith for the person’s benefit. Sections 91 and 92 deal with situations where consent is irrelevant, such as the offence of miscarriage, or where it cannot be obtained due to emergency or infirmity.

8. Defence of accident — Section 80

The defence of accident applies where an act causes harm that was neither intended nor foreseeable by a reasonable person in the accused’s position. Four conditions must all be present. The act causing harm must be lawful in itself. It must be done in a lawful manner and by lawful means. There must be a complete absence of criminal intention or knowledge. The act must have been done with proper care and caution.

An accident is something outside the ordinary course of events, something a reasonable person in the accused’s shoes would not have anticipated. The test is objective. Where negligence is present, the defence fails because negligence implies a lack of proper care. The classic example in the PPC itself illustrates this well: a workman whose hatchet head flies off and kills a bystander, where no carelessness on his part is shown, is not guilty of any offence.

9. Defence of person and property — Sections 96 to 106

The right of private defence of person and property is one of the most important general defences in the PPC. It is grounded in the natural human instinct of self-preservation and the broader principle of crime prevention. Every person has the right to defend themselves, another person, or their property against unlawful aggression.

When does the right arise?

The right to use force in self-defence begins as soon as a reasonable apprehension of danger arises and ends the moment that danger passes. The apprehension must be of immediate harm, not a future or speculative threat. A mere verbal threat, without any indication of immediate physical danger, is generally not sufficient to trigger the right. It is also not necessary that actual injury has already been inflicted. A genuine and reasonable belief that injury is about to be immediately caused is enough.

Doctrine of reasonable force

The right of private defence does not permit unlimited or disproportionate force. The force used must be reasonable and proportionate to the threat faced. A person defending themselves against a minor assault cannot use lethal force. The purpose of private defence is to prevent harm, not to inflict punishment. Using grossly disproportionate force takes the act outside the protection of the defence and may itself constitute a criminal offence.

Defence of property

A person in lawful possession of property may use reasonable force to defend it. If a thief has already taken possession and is fleeing, the owner may pursue and use reasonable force to recover the property. Section 105 makes clear that the right of private defence of property continues until the offender has escaped with the property, until public authority assistance is obtained, or until the property is recovered. Where a danger to bodily safety arises during the defence of property, the right of self-defence of the body also arises simultaneously.

In cases of surprise attacks by robbers or dacoits who are clearly about to break into a house, the occupier is entitled to use force, including potentially lethal force, without waiting for the actual entry. The law recognises the practical reality that waiting for the attack to begin may leave no opportunity for effective defence.

10. Past exam questions and answers

Key terms: general defences Pakistan Penal Code, PPC 1860 defences, defence of insanity Section 84, defence of minority Section 82 83, defence of intoxication PPC, private defence Section 96 to 106, compulsion Section 94 PPC, mistake of fact PPC, general exceptions criminal law Pakistan, LLB criminal law notes, CSS law paper Pakistan