Consent and Necessity Defences in Criminal Law

📑 On this page

⚡ The short answer

Consent excuses harm when someone old enough and free to choose agrees to it: a boxing bout, a risky surgery. It fails if given in fear, under a misconception of fact, or by a child under 12. Necessity excuses harm done in good faith, without intending it, to avoid a greater imminent harm. Neither excuses intentional killing.

🎬 The 30-second story

Smoke at the corner shop

“Is someone inside?!”

🔥

Rohan

Night. Smoke pours from Kabir's locked shop.

“Stand back!”

🔨

Rohan

Rohan smashes the shutter lock. No time to find Kabir.

“…”

🚑

Meher

Meher lies unconscious inside. Rohan drags her out, bruising her arm.

“You broke my shutter AND hurt her!”

🧾

Kabir

Next morning, Kabir wants to file a case.

Tara's ruling: No offence. The broken lock is necessity: harm foreseen, not intended, done in good faith to stop worse. The bruise is harm for Meher's benefit without consent: she couldn't say yes, and there was no time to ask anyone.

Both are general exceptions: the act is no offence at all, not a lighter sentence. Consent says you're the best judge of your own interests. Necessity says that in a sudden emergency you may pick the smaller of two unavoidable evils.

A passage might put it as: "Nothing is an offence if done in good faith, without criminal intention, to prevent other harm." Stay inside the limits and you walk; step outside and the full offence applies.

🧮 The formula

The necessity test, piece by piece

⚠️

Imminent danger

real, pressing

🤲

Good faith

due care

🧠

Knowledge, not intent

foreseen, not aimed

⚖️

Harm avoided is greater

question of fact

✅

No offence

📌 What CLAT actually expects

The passage gives the rule. Check who consented, how old, free or tricked, and whether the harm stayed within the limit. Good motive alone never saves anyone.

The law looks past the word "yes" to ask: was the person free, informed and capable?

🧭 Decision flow

Is this valid consent?

❓ Is the act an offence regardless of harm, like causing a miscarriage?

Yes →

Consent is irrelevant: still an offence

No ↓

❓ Was the person under 12, or unable to understand (unsound mind, intoxication)?

Yes →

No valid consent from them

Look for a guardian's consent or an emergency.

No ↓

❓ Was it given under fear of injury or a misconception of fact?

Yes →

❓ Did the doer know or have reason to believe it?

Yes →

Not consent in law

No ↓

❓ Does the harm stay within that consent's limit (never intended death)?

Yes →

Valid consent: defence applies

No →

Consent can't stretch this far

Note the two-sided test: the yes is tainted, and the doer knows or has reason to believe it.

⚠️ Submission is not consent

Every consent involves submission, but not every submission is consent. A threatened person who stops resisting hasn't agreed: that's fear, not a yes.

There are four consent rules. The less a person can decide for themselves, the tighter the leash.

🎚️ The scale

How much harm each kind of consent can cover

← You decide for yourselfThe law decides for you →

Adult's plain consent

Over 18: any harm short of death or grievous hurt, or its risk.

e.g. A fair punch in a boxing bout.

Consent for your benefit

For your benefit, in good faith: anything but intended death.

e.g. A risky heart surgery you agreed to.

Guardian's consent

Child under 12 or unsound mind. Serious risks only to save life or cure.

e.g. Parents okay their child's operation.

No consent possible

Nobody can say yes in time. Even hurt only to prevent death or hurt.

e.g. Surgery on an unconscious crash victim.

Two details CLAT loves. Benefit means real benefit, not money. Good faith means due care: a fake "doctor" operating with a kitchen knife has neither.

What about sport, fights and correction?

Games carry implied consent to fair-play knocks; a foul or a hit after the whistle falls outside it. Agreeing can't make a bare-knuckle fight lawful. Moderate correction by parents is allowed; injuring beatings are hurt.

Never for intentional killing. Kill an adult at his request and consent only drops murder to culpable homicide. The Supreme Court allows passive euthanasia under safeguards; active killing on request stays a crime.

CLAT built a whole 2021 passage on this. Was the promise false from the start, or genuine but later broken? Only the first is a misconception of fact that cancels consent.

⚔️ Side by side

False promise vs broken promise

🎭False promise

Never meant to keep it

•Lie told at the start to get a yes
•Doer knows the yes rests on it

💔Broken promise

Meant it, then couldn't or didn't

•Genuine intention when made
•Defeated by family or events

Test	False promise	Broken promise
Is consent valid?	No	Yes
Clue in the facts	Flees, cuts contact	Tries to persuade family

Judge the promise as it stood when consent was given.

When does necessity excuse a crime?

Necessity covers harm done with knowledge that it's likely, not intention to cause it: pulling down a house to stop a fire spreading. You may risk a death to save others; you may never pick a victim and kill him. How grave and imminent the danger was is a question of fact.

⚔️ Side by side

Necessity vs private defence

🔥Necessity

Choosing the lesser evil

•Any danger: fire, flood, animal
•Harm often falls on the innocent
•Knowledge of harm, no intent

🛡️Private defence

Hitting back at an attacker

•Needs an unlawful attack
•Harm falls on the attacker
•Harm may be intended, within limits

Test	Necessity	Private defence
Can it justify killing?	Never intentional killing	Yes, against grave threats
Key question	Was the harm avoided greater?	Was the force necessary?

Both are complete defences for different emergencies.

🚣

Landmark case · 1884 · Queen's Bench Division (England)

R v Dudley and Stephens

📋

What happened

Shipwrecked, four men drifted in an open boat. After days without food or water, two killed the weak 17-year-old cabin boy and ate him. Rescue came four days later.

❓

The question

Can necessity excuse deliberately killing an innocent to survive?

🔨

What the court held

Murder. No one may take another's life to save his own, or decide whose life is worth less. (The sentence was later commuted.)

What CLAT takes from it: Necessity may excuse a risk of harm, never intentionally killing an innocent.

🐍

Landmark case · 1869 · Calcutta High Court

Poonai Fattemah v Emperor

📋

What happened

A snake charmer persuaded a man he could protect him from snakebite. Believing it, the man let a poisonous snake bite him, and died.

❓

The question

Was the man's consent a defence?

🔨

What the court held

No. It was given under a misconception of fact the snake charmer himself created, so it was no consent at all.

What CLAT takes from it: A yes built on a false belief the doer planted is worthless.

💍

Landmark case · 2013 · Supreme Court

Deepak Gulati v State of Haryana

📋

What happened

A 19-year-old woman left home to marry the man she was seeing. They had sex on the way and were heading to court to marry when police stopped them. He was convicted of rape on a 'false promise' theory.

❓

The question

Did the promise make her consent a misconception of fact?

🔨

What the court held

Conviction set aside. A false promise made to get consent differs from the breach of a genuine one; nothing showed he never meant to marry her.

What CLAT takes from it: Ask what the promisor intended when consent was given.

📝 Asked in CLAT 2018 · Q192 Necessity knows no law

Statement: Necessity knows no law. Conclusions: 1. The act of a captain throwing some cargo into the ocean to save the ship from sinking is justified by the principle. 2. The act of a man out of poverty and starvation stealing some food from a hotel is justified by the principle. 3. The act of a tourist killing a tiger when it was attacking a villager is justified by the principle.

Examine the Statement and Conclusions given above and choose a suitable answer from the options given.

AOnly Conclusion 1 follows.

BOnly Conclusion 2 follows.

COnly Conclusion 1 and 3 follow.

DAll Conclusions follow.

Reveal answer + reasoning

Answer: C

Necessity is a sudden emergency where you choose the smaller harm: cargo for lives, a tiger for a villager. Ongoing poverty isn't. (Options were numbered 1–4; the key gives 3.)

Why the others fail

A — Leaves out the tiger, an equally clear emergency.
B — Hunger is the classic example of what necessity doesn't cover.
D — Includes the starving thief.

📝 Asked in CLAT 2019 · Q96 Benefit without consent

Principle: Nothing is an offence by reason of any harm it may cause to another person, if it is done in good faith and for the benefit of that person even without that person's consent. Facts: A is attacked by a Lion and Lion drags him while he is crying for help. B, a passer by picks up A's gun in good faith and fires at Lion which injures A. B has never used the gun before.

Choose the option that applies the principle.

AB is liable for the injury because he knew that he can injure A as he has never used any gun before

BB is not liable as he has done the act in good faith

CB is liable because he has not taken A's consent before firing

DB is liable because he has used A's gun without his consent

Reveal answer + reasoning

Answer: B

Our solution (no official key is available). The principle needs only good faith and A's benefit, both given. The words even without that person's consent kill C and D. Foreseeing that the shot might hit A doesn't matter; the harm wasn't intended.

Why the others fail

A — Foreseen risk doesn't defeat the principle.
C — It applies 'even without' consent.
D — Using the gun was part of the rescue.

📝 Asked in CLAT 2021 · Q104 False promise to marry

The Indian Penal Code, 1860 does not define 'consent' in positive terms … "A consent is not such a consent as is intended by any section of this Code, if the consent is given by a person under fear of injury, or under a misconception of fact, and if the person doing the act knows, or has reason to believe, that the consent was given in consequence of such fear or misconception;…" … The requirements of both the parts should be cumulatively satisfied. …

'X', a man, promises 'Y', a woman that he will marry her if she has sexual intercourse with him. 'Y' agrees and they have sexual intercourse. Thereafter, 'X' assures 'Y' that they will get married, but X's family is opposed to the marriage even after X's attempts to convince them. Therefore, 'X' refuses to marry 'Y'. In the given situation, which statement is true?

AConsent for sexual intercourse was received knowing that the consent is given under misconception of fact.

BConsent for sexual intercourse was given without any misconception of fact or fear of injury.

CConsent for sexual intercourse was received knowing that the consent is given under fear of injury.

DConsent for sexual intercourse was given under misconception of fact and received misconception of fact.

Reveal answer + reasoning

Answer: B

X kept assuring Y and tried to convince his family: the promise was genuine. A sincere promise later broken isn't a misconception of fact. Contrast Q101, where the man flees: key A, misconception.

Why the others fail

A — Nothing shows X knew his promise was hollow.
C — There's no threat in the facts.
D — No misconception, and no knowledge of one.

Also asked: 2021 Q102 (key C: both parts together) and Q103 (key D: not exhaustive). 2019 Q104: a social worker lifts a woman's veil "in good faith" without consent; our solution, criminal force, since motive is irrelevant.

⚠️ The 2019 drowning-boy dispute

2019 Q74: a rescuer abandons a drowning boy to hit back at an attacker. Our solution: A, no offence of killing the boy. He loses the necessity defence, but the principle creates no liability for abandoning a rescue. Some keys chose B.

💥 Myth vs fact

Myth vs fact

🙅 Myth

A good motive is as good as consent.

Tap to bust it →

✅ Fact

Motive is irrelevant. Without a valid yes or an excuse, force is force.

🙅 Myth

A yes is a yes.

Tap to bust it →

✅ Fact

Not if given in fear, under a planted false belief, by a child under 12, or without understanding.

🙅 Myth

If I ask you to kill me, you commit no crime.

Tap to bust it →

✅ Fact

Never for intended death. At best it cuts murder to culpable homicide.

🙅 Myth

Necessity knows no law, so a starving man may steal.

Tap to bust it →

✅ Fact

Necessity covers sudden, grave emergencies, not poverty.

🎯 Quick quiz

Five fact patterns: yes, emergency, or neither?

0 / 5

In a boxing bout, Aarav's fair punch breaks Zoya's nose. After the bell, still angry, he hits her again.

Q1. Which is correct?

Rohan tattoos Meher's 11-year-old brother, who begged for it. No parent was asked.

Q2. Can Rohan rely on the boy's consent?

Jobless and hungry for months, Aarav steals bread from Kabir's bakery.

Q3. Does necessity excuse him?

Rohan poses as a doctor. Trusting him, Zoya accepts an injection that makes her very ill.

Q4. Is Zoya's agreement a defence for Rohan?

For ₹50,000, Kabir lets a company test a risky drug on his healthy 10-year-old ward.

Q5. Is Kabir's consent a defence?

🎯 Consent and necessity in a nutshell

Both are complete defences: no offence at all.
Consent fails if given in fear or a misconception the doer knows of, or by a child under 12.
Four tiers: adult consent, consent for benefit, guardian's consent, emergencies.
A false promise cancels consent; a genuine one later broken doesn't.
Necessity covers foreseen harm in a sudden emergency. Neither covers intentional killing.

📎 Good to know, not to memorise

Bharatiya Nyaya Sanhita, 2023: necessity, section 19 (IPC 81). Consent, sections 25–31 (IPC 87–93); section 28 lists what isn't consent.
Good faith = due care and attention: BNS section 2(11) (IPC 52). Consent to death: Exception 5 to murder, BNS section 101. False promise to marry: separate offence, BNS section 69.
Cases: Dudley and Stephens (1884) 14 QBD 273; Poonai Fattemah (1869) 12 WR (Cr) 7; Deelip Singh v State of Bihar (2005), source of the 2021 passage; Deepak Gulati (2013) 7 SCC 675; Common Cause (2018) on passive euthanasia.

Turn the four tiers into reflex

Timed criminal law questions on general exceptions, with every answer explained.

Practise Criminal Law drills

Frequently asked questions

What is consent as a defence in criminal law?

If a person old enough and free to choose agrees to suffer some harm, or its risk, causing it is no offence: boxing, surgery. The consent must be genuine, not got by fear or deception, and not given by a child under 12 or someone unable to understand.

What is the difference between consent and necessity?

Consent depends on the injured person's agreement. Necessity needs nobody's: it excuses harm done in good faith, without intending it, to avoid a greater imminent harm, like breaking a door to rescue someone from a fire. Neither covers intentional killing.

Can a person consent to being killed?

No. If an adult genuinely consents to his own death, the killer's crime only drops from murder to culpable homicide not amounting to murder. Passive euthanasia under court-approved safeguards is a separate, narrow exception.

When does a promise to marry make consent invalid?

Only when it was false from the start, made with no intention of keeping it, just to get consent. That is a misconception of fact the accused knows about. A genuine promise later defeated by, say, family opposition leaves the consent valid.

Do I need to memorise section numbers for CLAT?

No. CLAT gives the rule in the passage and asks you to apply it. What matters is the limits: age, free and informed consent, good faith, imminent danger and the bar on intentional killing. The numbers sit in the Good to know box for reference.