"Analytically there are two different questions, was there a duty of care and, if so, is the defendant prevented from recovering damages by the application of the principle ex turpi causa non oritur actio. In fact, however, in my judgment the two questions inter-relate, but I will begin by considering them independently. There is no doubt that the police owe a duty of care to an arrested person. They must take reasonable care to ensure that he does not suffer physical injury as a consequence of their own acts, such as if they are driving carelessly or the acts of a third party, but the question here is whether they owed any duty to protect him from himself, in circumstances where the conduct of the claimant involves the commission of a criminal offence at common law, i.e. whether they must take reasonable care to ensure he does not injure himself, as a consequence of his own deliberate decision to escape from custody."
"Whether one expresses the refusal of a remedy as being based on absence of causation, absence of duty in these circumstances, absence of a breach of a wider duty, or as being based upon the application of a wider principle that a plaintiff as a matter of policy is denied recovery on tort when his own wrongdoing is so much part of the claim that it can not be overlooked, or because the plaintiff had voluntarily assumed the risk of it, is perhaps a matter of jurisprudential predilection on the part of the judge."
"No court will lend its aid to a man who founds his cause of action upon an immoral or illegal act."
"My Lords, save in one case I cannot find that such a plea has ever been put forward in circumstances similar to these as excusing common law negligence. If it were sound it would be a defence to many actions in which it was not raised and might also be a defence to many claims for compensation. Conceivably it may be a defence in certain cases between the participes criminis, but the argument that it may be a defence between the two persons involved does not support a conclusion that a third party whose servant is one of two involved in disobeying a regulation and so participating in a criminal offence is thereby absolved from liability."
"The maxim ex turpi causa is based on public policy, and it seems to me plain on the facts of this case that public policy, far from requiring that this action shall be dismissed, requires that it shall be entertained and decided on its merits."
"Reading the appropriate part of this definition back into section 1 makes it provide that where a person suffers damage as the result partly of his own breach of statutory duty which would, apart from this Act, give rise to the defence of contributory negligence his claim shall not be defeated…. [W]hatever the former position may have been, it is now clear that the appellants cannot rely on this defence [viz turpitude]."
"Where issues of illegality are raised, the courts have … to steer a middle course between two unacceptable positions. On the one hand it is unacceptable that any court should aid or lend its authority to a party seeking to pursue or enforce an object or agreement which the law prohibits. On the other hand, it is unacceptable that the court should, on the first indication of unlawfulness affecting any aspect of a transaction, draw up its skirts and refuse all assistance to the plaintiff, no matter how serious his loss nor how disproportionate his loss to the unlawfulness of his conduct."
"… a need in the law of tort for a principle which permits judges to deny recovery to a plaintiff on the ground that to do so would undermine the integrity of the justice system. The power is a limited one. Its use is justified where allowing the plaintiff's claim would introduce inconsistency into the fabric of the law, either by permitting the plaintiff to profit from an illegal or wrongful act, or to evade a penalty prescribed by criminal law. Its use is not justified where the plaintiff's claim is merely for compensation for personal injuries sustained as a consequence of the negligence of the defendant."
"…on the whole the courts have tended to adopt a pragmatic approach to these problems, seeking where possible to see that genuine wrongs are righted so long as the court does not thereby promote or countenance a nefarious object or bargain which it is bound to condemn. Where the plaintiff's action in truth arises directly ex turpi causa, he is likely to fail… Where the plaintiff has suffered a genuine wrong, to which the allegedly unlawful conduct is incidental, he is likely to succeed…"
"I have quoted at some length the considerations which have led courts to refuse on grounds of public policy to permit a person to enforce a claim to indemnity, for they illustrate to my mind how the courts have adjusted the application of the maxim to changing social conditions and in particular to the policy underlying the Road Traffic Acts. They establish, I believe, that it is the conduct of the person seeking to base his claim upon an unlawful act which is determinative of the application of the maxim."
"Finally, I would reject Mr Rees' submission that the decision of this Court in Reeves renders the judge's conclusion on public policy untenable. The actions of the deceased in that case were not unlawful, nor were they criminal. In Scott v Brown, Doering, McNab & Co[1892] 2 QB 724 at 728, Lindley LJ said of the maxim ex turpi causa non oritur actio : "
"No court will lend its aid to a man who founds his cause of action upon an immoral or illegal act."
"In my judgment, where the claimant is behaving unlawfully, or criminally, on the occasion when his cause of action in tort arises, his claim is not liable to be defeated ex turpi causa unless it is also established that the facts which give rise to it are inextricably linked with his criminal conduct. I have deliberately expressed myself in language which goes well beyond questions of causation in the general sense."