Plaintiff the Wrongdoer — Ex Turpi Causa

The defence that the plaintiff is himself a wrongdoer is the second of the general defences in the standard treatment of the law of torts. It rests on the maxim ex turpi causa non oritur actio — from an immoral or illegal cause no action arises. The maxim has a settled and reasonably narrow operation in the law of contract: a court will not aid a person whose cause of action is founded on an unlawful contract. Whether it has the same range in the law of torts has been doubtful for over a century. The Indian and English authorities converge on a careful middle position: the plaintiff's own wrongdoing does not, of itself, defeat his action — but where his unlawful act is the determining cause of the harm he complains of, the action will fail.

This chapter sets out the doctrine in full. It treats the leading authority of Bird v. Holbrook, the connection-test qualification approved in National Coal Board v. England, and the relationship between ex turpi causa, volenti non fit injuria and contributory negligence, which the candidate must be able to keep apart for the exam.

The maxim and its origin in contract law

The maxim ex turpi causa non oritur actio is an old principle of the common law and is most at home in the law of contract. The proposition is that no court will aid a person whose cause of action is founded on an immoral or illegal act. If the plaintiff has to plead an unlawful contract — say, a contract to commit a crime, or a contract in restraint of marriage, or a wagering agreement — to make out his case, the court will refuse to enforce it. The principle is shared by the Indian Contract Act, 1872 in Section 23 (object or consideration unlawful) and by the rule that the court will not aid in pari delicto claimants.

The question for tort is whether the same maxim, transposed into a context where the plaintiff need not plead any contract at all, has any equivalent force. It is doubtful, the leading textbooks observe, whether the defendant can take such a defence in tort and escape liability simply by pleading that, at the time of the wrongful act, the plaintiff was also engaged in something wrongful. The principle that has emerged is that the mere fact that the plaintiff was a wrongdoer does not, in itself, disentitle him from recovering for the defendant's wrongful act.

Mere wrongdoing by the plaintiff is no bar — Bird v. Holbrook

The starting authority is Bird v. Holbrook (1828) 4 Bing 628. The defendant set a spring gun in his walled garden — without notice — to deter the trespassers who had been stealing his tulips. The plaintiff, a young man, climbed over the wall in pursuit of an escaped peahen and was shot by the spring gun. The Court held that he could recover. The plaintiff was a trespasser; but his trespass did not forfeit his right of action against a defendant who had set a man-trap in secret and without warning. As the Court put it in Barnes v. Ward (1859) 9 CB 392, a trespasser "is liable to an action for the injury which he does: but he does not forfeit his right of an action for injury sustained."

The doctrine has a long pedigree. Green v. Carrol (1961) NZLR 1010 in the Commonwealth confirmed it, and the English courts have throughout treated the proposition as settled. The plaintiff may have to answer for his wrongful act independently — by criminal prosecution or by a civil action in his turn — but he does not lose his right of action for the harm caused to him.

The connection test — the classical limit on the rule

The classical formulation of the limit on the rule runs as follows. When the plaintiff himself is a wrongdoer, he is not disabled from recovering in tort "unless some unlawful act or conduct on his own part is connected with the harm suffered by him as part of the same transaction." The test is one of connection: is the plaintiff's own wrongful act bound up with the harm he has suffered, or is it a separate and independent matter?

The point is sharpened by Lord Asquith's well-known illustration, approved in National Coal Board v. England (1954) AC 403: "If A and B are proceeding to the premises which they intend burglariously to enter, and before they enter them, B picks A's pocket and steals his watch, I cannot prevail on myself to believe that A could not sue in tort (provided he had first prosecuted B for larceny). The theft is totally unconnected with the burglary." The fact that A is on his way to commit a burglary does not strip him of his property rights against a fellow conspirator who chooses that moment to commit a different crime against him.

The flip side of the test is the case where the plaintiff's own wrongdoing is the determining cause of the harm. The textbook illustration is the bridge case. A bridge under the defendant's control gives way when an overloaded truck of the plaintiff passes over it. If the truck was overloaded contrary to a warning notice and the bridge would not have given way had the truck been properly loaded, the plaintiff's wrongful act is the determining cause of the accident; even if the bridge was not in proper repair, the plaintiff's action will fail. If, on the other hand, the bridge would have given way even with a properly loaded truck, the determining cause is the defendant's negligent maintenance, and the plaintiff's action will succeed despite his overloading.

Three kinds of plaintiff-wrongdoer cases

It helps to keep the doctrine clean by separating three situations in which the plaintiff is a wrongdoer:

1. The plaintiff's wrong is collateral. The plaintiff was doing something unlawful at the time, but the defendant's wrong against him is independent of that unlawfulness. Bird v. Holbrook, Barnes v. Ward and the Asquith pickpocket-burglar example fall here. The action lies in full; the plaintiff is liable to be prosecuted or sued for his own wrongful act separately, but that is no defence in his action against the defendant.
2. The plaintiff's wrong is the determining cause of the harm. The overloaded-truck illustration is the example. Here the action fails because the plaintiff's own act is what brought about the very harm he complains of.
3. The plaintiff is contributorily negligent. Here the plaintiff and the defendant are both at fault, the plaintiff's fault contributing to his own harm. The action does not fail; the damages are reduced in proportion to the plaintiff's share of fault. The chapter on contributory negligence and the last opportunity rule develops this defence in detail.

The Indian textbooks make clear that the second category is the one where ex turpi causa truly bites. The first category is governed by the classical rule that the plaintiff does not forfeit his right of action; the third is governed by the apportionment doctrine.

Hegarty v. Shine and the doctrine in personal-tort cases

The maxim has been pleaded successfully in some personal-tort cases where the plaintiff's own conduct was the foundation of his claim. In the Irish case of Hegarty v. Shine (1878) 4 LR Ir 288, the plaintiff's paramour had infected her with venereal disease and she sued for assault. The action failed partly on the ground that mere non-disclosure of the disease was not such a fraud as to vitiate consent — a holding that runs through the law of free consent in tort — and partly on the ground of ex turpi causa non oritur actio. The case is a useful reminder that the maxim and the doctrine of vitiated consent often overlap on the same facts.

The trespasser cases — limits on the protection

The trespasser is the most common plaintiff-wrongdoer in the case law. The starting position is that an occupier cannot inflict unnecessary injury on a trespasser. Bird v. Holbrook establishes that the occupier may not set a hidden man-trap; the spring gun without notice is an excessive response to mere trespass. But where the occupier has given notice, or the trespasser has actual knowledge of the danger, the position changes. In Illot v. Wilkes (1820) 3 B&Ald 304, a trespasser who knew about the spring guns could not recover when he was shot — there the action failed not on the basis of ex turpi causa alone but because the consent defence applied. Damage caused to a trespasser by broken glass on a wall, by spikes, or by a fierce dog kept with notice (Sarch v. Blackburn (1830) 4 C&P 297) is also not actionable.

The Indian decisions follow the same line. The duty owed by the occupier to a trespasser is much lower than that owed to a lawful entrant — but it is not zero. Reckless endangerment of trespassers, hidden traps, and disproportionate force in the protection of property remain actionable. The doctrine of trespassers and dangerous premises is treated more fully in the chapters on trespass to land and on liability for dangerous premises.

Distinguishing ex turpi causa from cognate doctrines

Three doctrines lie close to ex turpi causa and are routinely confused with it. The exam-aspirant must be able to distinguish:

Volenti non fit injuria

Volenti rests on the plaintiff's consent — express or implied — to the risk that has materialised. It is a complete defence. Ex turpi causa rests on the plaintiff's unlawful act, and operates only where that act is the determining cause of his harm. The two doctrines may apply on the same facts (as in Hegarty v. Shine) but they are conceptually distinct.

Contributory negligence

Contributory negligence operates when both parties are negligent. It does not bar the action; under the Law Reform (Contributory Negligence) Act, 1945 in England and the corresponding Indian rule, it only reduces damages in proportion to the plaintiff's share of fault. Ex turpi causa, by contrast, when it applies, bars the action altogether. Contributory negligence presupposes negligence on the plaintiff's part; ex turpi causa presupposes a wrongful or unlawful act, which need not be negligent.

Inevitable accident

Inevitable accident is not a doctrine about the plaintiff at all; it is a defence asserting that the harm was unavoidable despite reasonable care on the defendant's part. The defence operates where neither party is at fault. Ex turpi causa, in contrast, operates where the plaintiff's own act is at fault and that fault is causally decisive.

The role of the maxim in modern Indian law

The Indian courts have, on the whole, applied the principle cautiously. There has been no Supreme Court decision treating ex turpi causa as a general bar to a tort action; the doctrine appears chiefly in the form of the connection test and in the trespasser cases, where it overlaps with volenti and with the limited duty owed to trespassers. The Indian commentators have followed the English position — that the defendant cannot escape liability for his own wrongful act simply by pointing out that the plaintiff was, at the relevant time, also doing something wrongful.

Three observations should be made about the modern operation of the doctrine in Indian conditions. First, in motor-vehicle cases governed by the Motor Vehicles Act, 1988, even contributory negligence of the victim is no defence to the no-fault liability under Sections 140 and 163-A; ex turpi causa likewise has no field of operation against a statutory liability of that kind. Second, in cases of constitutional tort following Rudul Sah v. State of Bihar (1983) 4 SCC 141, the Supreme Court has consistently treated the violation of fundamental rights as the cause of action and refused to allow the State to plead ex turpi causa where the petitioner was in custody on suspicion of crime. Third, in the law of strict liability and absolute liability, the defences are exhaustively set out in the rule itself, and the maxim adds nothing.

Application to fact-patterns — the exam angle

A typical question in this area will present a plaintiff who is doing something unlawful at the relevant moment — burglarious trespass, riding without a helmet, illegally constructing without sanction — and the defendant whose own conduct has caused him harm. The candidate's reasoning should proceed in four steps:

1. Identify the plaintiff's unlawful act. Is it trespass, theft, breach of statute, or something else?
2. Identify the harm. What injury or loss has the plaintiff suffered, and from what conduct of the defendant?
3. Apply the connection test. Is the plaintiff's unlawful act bound up with the harm — is it the determining cause? Or is it a separate, collateral wrong, like the burglar's unstolen watch in Asquith's example?
4. Decide the consequence. If the plaintiff's act is the determining cause, the action fails. If it is collateral, the action lies in full, with the plaintiff's wrongdoing being a matter for separate proceedings against him. If both parties are negligent, contributory negligence reduces the damages.

The classical fact-patterns are: the trespasser shot by a hidden spring gun (Bird v. Holbrook — action lies); the trespasser shot by a spring gun he knew about (Illot v. Wilkes — action does not lie, on volenti grounds); the burglar whose pocket is picked en route (Asquith's example — action lies); the overloaded-truck driver whose vehicle breaks the bridge (action fails — own act is determining cause); the unauthorised builder whose construction is demolished (Town Area Committee v. Prabhu Dayal — action fails on damnum sine injuria grounds, with ex turpi causa as a parallel ground).

Where the maxim sits in the larger doctrine

The chapter on the plaintiff as wrongdoer sits second in the standard sequence of general defences, after the chapter on consent and assumption of risk and before the chapter on inevitable accident. Each of these defences operates on a different conceptual axis: volenti negatives the plaintiff's right by reason of his consent; ex turpi causa negatives it by reason of his own unlawful act; inevitable accident negatives the defendant's wrongdoing by reason of the absence of any fault. Together with act of God, private defence, mistake, necessity and statutory authority, they make up the eight general defences that have to be considered in every tort action before the cause of action can be said to be made out.

A note on the rescuer and the plaintiff-wrongdoer

One interesting modern question is the position of the rescuer who is himself unlawfully on the premises. The rescue principle developed in Haynes v. Harwood (1935) 1 KB 146 — discussed in the chapter on volenti — gives the rescuer an independent right of action that is not affected by defences the defendant may have against the victim. Where the rescuer's presence is independently unlawful, the question becomes one of the connection test: is the rescuer's unlawful presence the determining cause of the harm, or is it collateral to a rescue that any reasonable person would have attempted? The case law leans towards letting the rescuer recover in all but the clearest cases of the rescuer being himself the chief author of the danger. Lord Justice Williamer's words in Baker v. T.E. Hopkins & Son (1959) 1 WLR 966 — "It would certainly be a strange result if the law were held to penalise the courage of the rescuer by depriving him of any remedy" — capture the policy.

Comparative perspective and modern doctrinal trajectory

It is worth noting that the English law on ex turpi causa has continued to evolve. In Pitts v. Hunt (1991) 1 QB 24, the Court of Appeal denied recovery to a passenger injured while encouraging the drunken driver of a motorcycle to drive recklessly; the joint criminal enterprise was the determining cause of the harm and the action was barred. In Clunis v. Camden & Islington Health Authority (1998) QB 978, the plaintiff, who had been convicted of manslaughter, sued the health authority for negligence in failing to detain him under the Mental Health Act; the action was barred by ex turpi causa because the cause of action arose directly from the plaintiff's own criminal act. The most recent statement is in Patel v. Mirza (2016) UKSC 42, where the Supreme Court of the United Kingdom adopted a more flexible policy-based approach: the question is whether allowing the claim would be inconsistent with the policy underlying the rule that made the plaintiff's conduct unlawful, judged in the round.

The Indian courts have not yet adopted the Patel v. Mirza reasoning expressly, but the underlying policy approach is consistent with the careful, fact-sensitive way in which the doctrine has always been applied here. The connection test — does the plaintiff's wrongful act stand in a determining causal relation to the harm? — is the working tool of the Indian decisions and remains the safer formulation for the exam-aspirant to learn first.

Special cases — joint illegal enterprise

The clearest case for the operation of the maxim is the joint illegal enterprise: two or more people engage together in a criminal venture, and one of them is injured by the negligence of the other in the course of that venture. Pitts v. Hunt illustrates the position. The negligent driving was the very means by which the criminal enterprise was being prosecuted; the action was held to be barred. In Indian conditions, the same principle would be applied through the connection test: where the plaintiff and the defendant were engaged in a common unlawful act and the injury flowed from the manner in which that act was being committed, the plaintiff's wrongful conduct is the determining cause and his action will fail.

Summary

The defence of plaintiff-the-wrongdoer rests on the maxim ex turpi causa non oritur actio. The doctrine operates narrowly in the law of torts. The mere fact that the plaintiff was a wrongdoer at the time of the defendant's act does not bar his action: Bird v. Holbrook, Barnes v. Ward and the Asquith pickpocket example establish the rule. The doctrine bars the action only where the plaintiff's unlawful act is the determining cause of his harm — the connection test, approved in National Coal Board v. England. The defence is closely related to, but conceptually distinct from, volenti non fit injuria and contributory negligence. The student who can keep these three defences sharply apart, and who can apply the connection test to a fact-pattern, has mastered an area where careless reasoning costs the most marks.

Frequently asked questions

Does the maxim ex turpi causa non oritur actio apply to the law of torts in the same way as to contracts?

No. In contract, the maxim is a settled rule: a court will not enforce a contract whose object or consideration is unlawful. In tort, the operation is much narrower. The mere fact that the plaintiff was doing something unlawful at the time of the defendant's wrong does not defeat his action. The classical authority is Bird v. Holbrook (1828) 4 Bing 628 — a trespasser shot by a hidden spring gun was held entitled to compensation. The classical qualification — that the maxim bites only when the plaintiff's unlawful act is connected with the harm as part of the same transaction — captures the limited scope of the doctrine in tort.

What is the connection test for ex turpi causa?

The classical formulation runs as follows: when the plaintiff is a wrongdoer he is not disabled from recovering in tort unless some unlawful act or conduct on his part is connected with the harm suffered by him as part of the same transaction. The test asks whether the plaintiff's wrongful act is the determining cause of his harm, or merely collateral to it. The Asquith illustration in National Coal Board v. England — the burglar pickpocketed en route to the burglary — shows the collateral case; the overloaded-truck-on-the-defective-bridge example shows the determining-cause case.

Can a trespasser recover damages from the occupier?

It depends on the occupier's conduct. The occupier cannot inflict unnecessary or hidden injury on a trespasser. Bird v. Holbrook held that a trespasser shot by an unposted spring gun could recover; the trap was disproportionate. But where the occupier has given notice and the trespasser has knowledge of the danger, the defence of volenti non fit injuria operates. Damage by broken glass on a wall, spikes or a fierce dog kept with notice is not actionable. The duty owed to a trespasser is reduced but not zero.

How does ex turpi causa differ from contributory negligence?

Ex turpi causa is a complete defence: when it applies, the action fails entirely. Contributory negligence is only an apportionment defence: damages are reduced in proportion to the plaintiff's share of fault. Ex turpi causa requires a wrongful or unlawful act by the plaintiff that is the determining cause of his harm; contributory negligence requires only failure to take reasonable care for one's own safety. Contributory negligence is the modern instrument that handles most cases where the plaintiff is partly at fault, leaving ex turpi causa for the limited class of cases where the plaintiff's act is unlawful and causally decisive.

Why was ex turpi causa pleaded in Hegarty v. Shine?

In Hegarty v. Shine (1878) 4 LR Ir 288 the plaintiff had been infected with venereal disease by her paramour and sued him for assault. The Irish court rejected the action on two parallel grounds: first, that mere non-disclosure of the disease was not the kind of fraud that vitiates consent, so volenti non fit injuria applied; second, that the plaintiff's cause of action arose out of an immoral relationship, attracting ex turpi causa. The case illustrates how the two doctrines often run together on the same facts but rest on distinct conceptual grounds — consent in the first, unlawfulness in the second.

Does the rescuer who is himself unlawfully present lose his action under ex turpi causa?

Generally no. The rescue principle developed in Haynes v. Harwood (1935) 1 KB 146 gives the rescuer an independent right of action against the negligent defendant. The presence of an independent wrong on the rescuer's part — say, trespass to be in the place of rescue — has not been treated by the courts as defeating the action, save in the rarest cases where the rescuer himself created the danger. Lord Justice Williamer's observation in Baker v. T.E. Hopkins & Son captures the policy: the law should not penalise the courage of the rescuer.