Who may testify
The rule of competency. Everyone is competent to be a witness — a child, an elderly person, one who is ill or of unsound mind — unless the court finds they cannot understand the questions or give rational answers, by tender years, extreme old age, disease, or a like cause.
How to read Section 124
Everyone can testify — the only question is whether the person can understand the questions and answer them rationally.
All persons are competent to testify — competency is the default.
Can the person understand the questions and give rational answers? That capacity is all that matters.
Incapacity from tender years, extreme old age, disease (of body or mind), or any like cause — but only if it actually prevents understanding or rational answers.
The bare Act
The section in its own words — the rule and an Explanation.
All persons shall be competent to testify unless the Court considers that they are prevented from understanding the questions put to them, or from giving rational answers to those questions, by tender years, extreme old age, disease, whether of body or mind, or any other cause of the same kind.
Explanation.—A person of unsound mind is not incompetent to testify, unless he is prevented by his unsoundness of mind from understanding the questions put to him and giving rational answers to them.
In short: the starting point is inclusion, not exclusion — every person is a competent witness. Age, illness, even unsoundness of mind do not by themselves shut a person out. The single, functional test is capacity: can this person understand the questions put to them and give rational answers? Only where the court finds that capacity is absent — and absent because of tender years, extreme old age, disease of body or mind, or a cause of the same kind — is the person incompetent. The Explanation drives the point home for mental illness: a person of unsound mind is not incompetent merely for being so; he is barred only if his unsoundness actually prevents him from understanding and answering rationally (so a witness in a lucid state may testify). Note the limit: competency is only about capacity to give evidence — whether that evidence is ultimately believed is a separate question of credibility.
→ This carries forward IEA 1872 § 118 — and opens Chapter IX on witnesses.
Glossary
Legally allowed to be a witness and give evidence.
Very young age — a child witness.
Very advanced age, where capacity may be in question.
Illness, physical or mental, that may affect the capacity to understand and answer.
A like incapacity — something similar in nature to the listed causes.
Competency is capacity to testify; whether the evidence is believed is a separate question.
The picture
Competency is the default — a person is barred only if a listed cause actually destroys the capacity to understand and answer.
The section, part by part
Tap a part — the picture-story tells it first; the word-by-word text and example follow.
the ruleEveryone is competent — unless a listed cause destroys the capacity
unsound mindMental illness bars a witness only when it actually blocks understanding
Connected provisions
Estoppel of acceptor / bailee
The close of Chapter VIII (Estoppel) — the chapter just before witnesses.
Of Witnesses
§ 124 opens Chapter IX — who may give evidence, and how. See the chapter map.
Witness unable to communicate verbally
How a witness who cannot speak may still give evidence — by writing or signs, in open court.
IEA 1872, § 118
Carried forward — the general test of competency of witnesses.
