Custom is the best interpreter of the law.

Explanation

When the meaning of a law is disputed, the long-established practice of the People under that law is the surest guide to its true intent.

Where this applies

• Two parties disagree about what a law means, and one points to how people have followed it for decades.
• A statute is ambiguous and the court looks at long-standing practice to interpret it.

See also

• 1.2.2 The general custom of the whole country is the common law of the country.
• 1.3.6 Custom is observed as law.