The Mischief Rule and Heydon's Case

The mischief rule is the oldest of the rules of interpretation and the forerunner of the modern purposive approach. It asks why the statute was passed: what defect in the earlier law Parliament set out to cure. The words are then read so as to suppress that mischief and advance the remedy. This note sets out Heydon's Case and its four questions, the leading English and Indian applications, and the conditions and limits of the rule.

1. Heydon's Case (1584)

In Heydon's Case the Barons of the Exchequer resolved that, for the sure and true interpretation of all statutes, four things are to be discerned and considered. Having answered them, the office of all judges is always to make such construction as shall suppress the mischief and advance the remedy, and to suppress subtle inventions and evasions for continuance of the mischief.

Figure 1: The four questions

• The law before the Act. Identify the state of the law before the statute was enacted.
• The mischief. Identify the defect for which the earlier law did not provide.
• The remedy. Identify the remedy Parliament chose to cure that defect.
• The reason. Identify the true reason for the remedy, and then read the words to suppress the mischief and advance the remedy.

2. English Applications

Figure 2: The mischief rule in English and Indian courts

• Corkery v Carpenter (1951). The accused was drunk in charge of a bicycle. The Act punished being drunk in charge of a carriage. Since the mischief was the danger posed by drunken persons in charge of vehicles on the highway, a bicycle was held to be a carriage.
• Smith v Hughes (1960). Prostitutes solicited men from balconies and windows. The Street Offences Act 1959 punished soliciting in a street. Lord Parker CJ held the mischief was the molestation of people using the street, and the solicitation was directed at them, so the women were convicted.
• RCN v DHSS (1981). The Abortion Act 1967 permitted terminations by a registered medical practitioner. The House of Lords, by majority, held that nurses carrying out medically induced terminations under a doctor's supervision acted lawfully, since the Act aimed to end unsafe illegal abortions and secure them in hospitals under medical control.

3. The Rule in India

• Bengal Immunity (1955). Interpreting Article 286, the Supreme Court applied Heydon's rule, identifying the mischief as the multiple taxation of inter-State sales by different States, and read the provision to remedy it.
• Sodra Devi v CIT (1957). Section 16(3) of the Income Tax Act 1922 included in an individual's income the income of his wife and minor children. The Court applied Heydon's rule and confined any individual to males, the mischief being the evasion of tax by men transferring assets to their wives and minor children.
• When used. Indian courts invoke the rule where the words are ambiguous or capable of more than one meaning; where they are clear, the literal meaning prevails (Topic 3)

4. Merits, Criticisms and Limits

• Merit. Gives effect to the real object of the statute and closes loopholes that literal reading would leave open.
• Merit. Prevents evasion: Heydon's Case itself directs courts to suppress subtle inventions for continuing the mischief.
• Criticism. It was framed when statutes were few and supplemented the common law; modern statutes often create entirely new schemes with no single mischief.
• Limit. It cannot be used to contradict clear words or to supply a remedy Parliament chose not to provide (Topic 11)

The mischief rule is the historical root of the modern purposive approach, which asks not only what defect was remedied but what the statute as a whole is designed to achieve (Topic 6).

5. Frequently Asked Questions

What is the mischief rule?

The mischief rule requires a court to interpret a statute in the light of the defect it was enacted to remedy. Laid down in Heydon's Case (1584), it directs the court to consider the law before the Act, the mischief for which that law did not provide, the remedy Parliament adopted and the true reason for it, and then to construe the statute so as to suppress the mischief and advance the remedy.

What are the four questions in Heydon's Case?

First, what was the common law before the making of the Act. Second, what was the mischief and defect for which the common law did not provide. Third, what remedy Parliament has resolved and appointed to cure the disease. Fourth, the true reason of the remedy. The judge must then make such construction as shall suppress the mischief and advance the remedy.

Has the Supreme Court applied the mischief rule?

Yes. In Bengal Immunity Co v State of Bihar (1955) the Court applied Heydon's rule to interpret Article 286 of the Constitution on taxation of inter-State sales, and in Sodra Devi v Commissioner of Income Tax (1957) it used the rule to confine the words 'any individual' in the Income Tax Act 1922 to males, in view of the mischief the provision was designed to address.

6. Related Topics

• Topic 6: Purposive Interpretation. The modern descendant of the mischief rule.
• Topic 13: External Aids to Interpretation. The sources used to identify the mischief.