What is the Law of Evidence in Nigeria? Meaning, Scope and Classification

Imagine you are sitting in the gallery of the Oyo State High Court watching a murder trial. The prosecution counsel stands up and says the accused was seen leaving the scene of the crime. The defence counsel jumps up and objects. The judge asks: what is the basis for that objection? What follows is not an argument about whether the accused actually killed anyone. It is an argument about whether the way that fact is being proved is legally acceptable. That argument, the debate about how facts are established in court, is exactly what the law of evidence is about.

Every Nigerian law student encounters evidence law as one of the most technical courses in the curriculum, and for good reason. You can know the most airtight defence in criminal law, but if you cannot get your evidence in front of the court in the right way, that defence is worthless. This article introduces you to what the law of evidence actually is, why it exists, how it is classified, and which courts it applies to in Nigeria.

What Evidence Means: The Definitions You Need to Know

There is no single statutory definition of the word “evidence” in the Evidence Act 2011. The Act defines specific types of evidence and specific concepts within evidence law, but it does not open with a one-sentence definition of evidence itself. This is why writers and courts have offered several definitions that are worth knowing.

Phipson defines evidence as the testimony, whether oral, documentary or real, which may be legally received in order to prove or disprove some facts in dispute.¹ This is probably the most widely cited definition in Nigerian courts and classrooms.

Taylor takes a broader approach. He defines evidence as all legal means, exclusive of mere argument, which tend to prove or disprove any matter of fact, the truth of which is submitted to judicial investigation.² The important phrase in Taylor’s definition is “exclusive of mere argument.” Evidence is not the same thing as an argument made by a lawyer. A lawyer’s closing address is an argument. The testimony of a witness who saw something happen is evidence.

Aguda offers a simpler version: evidence is the means by which facts are proved, but excluding inferences and arguments.³ McKelvey captures the concept from a different angle. He says evidence is any matter of fact from which an inference may be drawn as to another matter of fact.⁴

The Supreme Court brought clarity in the Nigerian context in the case of Akintola v Solano,⁵ where Oputa JSC put it plainly: “Evidence is the means by which any matter of fact the truth of which is submitted to investigation may be established or disproved.”

The working definition that brings these together is this: evidence is the totality of the means by which facts in issue are proved or disproved before a court of law, and it takes the form of oral testimony, documents, or things produced for the court’s inspection.

Two Nigerian cases that have reinforced this in contemporary decisions are Arum v Nwobodo,⁶ where evidence was defined as the means employed for the purpose of proving a disputed fact, and Tukur v UBA,⁷ where the court held that evidence is the means from which an inference can logically be drawn as to the existence of a fact.

Law of Evidence vs Evidence: An Important Distinction

Students sometimes confuse “evidence” with “the law of evidence.” They are not the same thing.

Evidence is the material itself, the testimony, the documents, the real objects brought before a court. The law of evidence is the body of rules that governs whether that material is legally acceptable, who can present it, in what form it must come, and what weight the court can give it.

Stephen described the law of evidence as that part of the law of procedure which, with a view to ascertaining individual rights and liabilities in particular cases, answers three questions: what facts may and may not be proved in a case; what sort of evidence must be given of a provable fact; and by whom and in what manner must that evidence be produced.⁸

For the Nigerian law student, this means that evidence law tells you the rules of the game before any trial begins.

Evidence Law as Adjectival Law

One of the most examined distinctions in evidence law is the classification of the law of evidence as adjectival law rather than substantive law.

Substantive law defines rights, duties and liabilities. The law of contract tells you what makes an agreement binding. Criminal law tells you which acts are offences and what punishment follows. The law of torts tells you what wrongs give rise to a claim for damages. These are all substantive laws. They tell you what your rights and obligations actually are.

Adjectival law, by contrast, governs the machinery by which substantive law is applied in practice.⁹ It regulates the conduct of litigation and establishes how the facts on which rights and duties depend are to be proved. The law of evidence falls squarely within adjectival law. It does not create any new right or liability. It tells you how you prove the facts that give rise to rights and liabilities that substantive law has already defined.

Consider a simple example. If someone injures you through negligence, the law of torts gives you a right to claim damages. That is the substantive law. But when you go to court to enforce that right, the question of how you prove that the defendant was negligent, what witnesses you can call, what documents you can tender, and what standard of proof applies to your claim, all of that is governed by the law of evidence.

Understanding evidence law as adjectival law also explains why it sits alongside procedure in legal study. Procedure deals with how proceedings are commenced and conducted. Evidence law deals with how facts within those proceedings are established. Together they form the practical machinery of litigation.

The Four Questions Evidence Law Answers

The rules of evidence exist to assist courts in resolving four fundamental questions in every proceeding.

The first question is: upon whom does the burden of proof rest? The basic principle is that he who asserts must prove. In a criminal case, the prosecution asserts that the accused committed an offence, so the prosecution bears the burden of proving it. In a civil case, the plaintiff asserts that the defendant wronged him, so the plaintiff generally bears the burden of proof. This is not absolute. Some defences in criminal cases, like insanity, alibi, and provocation, place an evidential burden on the accused.¹⁰ We examine burden and standard of proof in detail in a separate article.

The second question is: what facts may be proved? A party is generally required to prove every material fact on which they rely. But there are exceptions. Courts must take judicial notice of certain facts without evidence being led, such as the laws of Nigeria, the names of states and their capitals, and matters of general public knowledge.¹¹ Facts that are admitted by the opposing party need not be proved. Notorious facts and certain presumptions operate in a similar way. We cover those in detail here.

The third question is: what facts must be excluded? Not every relevant fact can be admitted. The law of evidence identifies certain categories of evidence that, however relevant they may seem, must be kept out. Evidence of an accused person’s bad character is generally inadmissible.¹² Hearsay is generally excluded. Privileged communications are protected. The policy reasons behind these exclusions are as important as the rules themselves.

The fourth question is: what methods of proof are acceptable? Nigerian courts recognise three main methods: real evidence under section 127 of the Evidence Act 2011, oral evidence under sections 125 and 126, and documentary evidence under sections 83 to 91 and 128 to 130.¹³

Classification of Evidence in Nigeria

Evidence law in Nigeria classifies evidence in several ways. These classifications are not just theoretical. They determine which rules apply to which type of evidence in court.

Oral, Documentary and Real Evidence

The most fundamental classification comes from the nature of the evidence itself.

Oral evidence is testimony given by a witness in the witness box. Under section 125 of the Evidence Act 2011, oral evidence includes all statements which the court permits or requires to be made before it by witnesses in relation to matters of fact under inquiry. Oral evidence must be direct under section 126, meaning a witness can only speak to what they personally saw, heard or perceived.

Documentary evidence is evidence conveyed through documents. The definition of “document” in section 258(1) of the Evidence Act 2011 is deliberately wide. It includes books, maps, plans, graphs, drawings, photographs, discs, tapes, soundtracks, film, and anything on which information is recorded or stored. Documentary evidence is further divided into primary and secondary evidence under sections 86 and 87 respectively, with primary evidence being the document itself and secondary evidence being copies or oral accounts of its contents.

Real evidence is physical objects produced for the court’s inspection. Under section 127 of the Evidence Act 2011, when a court inspects anything to which the evidence relates, that inspection constitutes real evidence. A murder weapon tendered in court, a vehicle involved in an accident, or a piece of land visited by the judge during a locus in quo inspection, all of these are forms of real evidence.

Direct and Circumstantial Evidence

Direct evidence is evidence that, if believed, directly establishes the fact in issue without requiring any inference. The eyewitness testimony of a person who saw the accused stab the deceased is direct evidence. Section 126 of the Evidence Act 2011 defines when oral evidence qualifies as direct. We examine direct evidence in full here.

Circumstantial evidence is indirect. It does not directly establish the fact in issue but requires the court to draw an inference from a set of facts that, taken together, point strongly towards a conclusion. A court can convict on circumstantial evidence alone. The Supreme Court has affirmed this in several cases, holding that circumstantial evidence can be more compelling than direct evidence in some situations. We examine circumstantial evidence in full here.

Hearsay and Original Evidence

Hearsay evidence is a statement made out of court, oral or written, which is tendered for the purpose of proving the truth of the matter stated in it.¹⁴ The general rule is that hearsay is inadmissible. There are exceptions under sections 39 to 52 of the Evidence Act 2011. Original evidence is evidence of what was said or written that is tendered not to prove the truth of what was said, but simply to prove that those words were spoken or written. This distinction is important and often tested in examinations.

Primary and Secondary Evidence

This classification applies specifically to documents. Primary evidence under section 86 is the document itself produced for the court’s inspection. Secondary evidence under section 87 is evidence of the contents of a document other than the document itself, including certified copies, copies made from the original, and oral accounts of the contents of the original. Secondary evidence is only admissible in specific circumstances defined by sections 88 and 89, for example when the original has been lost or destroyed.

Judicial and Extrajudicial Evidence

Judicial evidence is evidence given in the very proceedings before the court. Extrajudicial evidence is evidence given in other proceedings or in other contexts. Confessions made to police before trial are a classic example of extrajudicial evidence. The rules for admitting extrajudicial evidence are strict and are governed by specific provisions of the Evidence Act 2011, particularly sections 28 to 32 on confessions.

The Constitutional Dimension: Section 36 and the Law of Evidence

Here is where many students miss a significant layer of evidence law that is rarely taught as part of the formal doctrine.

The Evidence Act 2011 does not operate in isolation. The Constitution of the Federal Republic of Nigeria 1999 sits above it, and several provisions of the Constitution directly shape how evidence law operates in practice.

Section 36 of the 1999 Constitution guarantees the right to fair hearing. This provision has multiple dimensions that touch directly on evidence law.

Section 36(1) guarantees that every person is entitled to a fair hearing within a reasonable time by a court or other tribunal established by law and constituted in such a manner as to secure its independence and impartiality.

Section 36(5) provides that every person charged with a criminal offence shall be presumed innocent until proven guilty according to law. This is the constitutional foundation of the burden of proof in criminal cases. When the Evidence Act says the prosecution must prove guilt beyond reasonable doubt, it is giving statutory content to a constitutional right.

Section 36(6)(a) to (d) guarantees the right of an accused person to cross-examine prosecution witnesses. The rules of cross-examination in the Evidence Act 2011, particularly sections 214 to 234, are therefore not merely statutory. They implement a constitutional right. When a court denies an accused person the opportunity to cross-examine a witness against him, the problem is not just a procedural irregularity. It is a constitutional violation.

Section 36(11) provides that no person tried for a criminal offence shall be compelled to give evidence at trial. This underpins the right of an accused to remain silent and shapes how the court must interpret the failure of an accused to testify.

In the case of Gwonto v The State,¹⁵ the Court of Appeal held that where a fundamental right enshrined in the Constitution has been denied or withheld, no provision of any other enactment can save the illegality created by its non-compliance. This means that a rule of evidence that violates section 36 is not merely inadmissible evidence. It makes the entire proceeding potentially void.

Students who understand this constitutional layer will write examination answers that stand out from those who treat the Evidence Act as if it exists in a vacuum.

Which Courts Does the Evidence Act 2011 Apply To?

Section 256(1) of the Evidence Act 2011 provides the answer. The Act applies to all judicial proceedings in or before courts in Nigeria, with specific exceptions.

The courts and tribunals to which the Evidence Act does not apply include arbitrators, courts martial, the Sharia Court of Appeal, the Customary Court of Appeal, area courts, and customary courts.

There is an important qualification. Even in criminal matters before area courts, the provisions of the Act relating to burden of proof apply. The Evidence Act is therefore not entirely excluded from the jurisdiction of area courts in criminal proceedings.

The practical significance of this is that a lawyer appearing before a High Court, the Federal High Court, the Court of Appeal, or the Supreme Court is bound by the full provisions of the Evidence Act 2011. The Act was placed on the Exclusive Legislative List of the Constitution, which means only the National Assembly can legislate on it. State Houses of Assembly cannot create their own parallel evidence rules for proceedings in their State High Courts.

The Relationship Between the Evidence Act and Common Law

Before the Evidence Act 2011 came into force on 3 June 2011, section 5(a) of the old Evidence Act preserved the operation of the English common law of evidence in Nigerian courts. That provision allowed courts to admit evidence that would have been admissible under the common law rules that existed before the first Evidence Ordinance came into operation in 1945.

The Evidence Act 2011 changed this. Section 3 of the 2011 Act now provides that nothing in the Act shall prejudice the admissibility of any evidence that is made admissible by any other legislation validly in force in Nigeria. The critical word is “legislation.” Common law is not legislation. The result is that the English common law of evidence no longer operates as a free-standing source of admissibility in Nigerian courts. If a rule of evidence is not found in the Evidence Act 2011 or in some other Nigerian statute, it cannot be admitted by reference to the common law alone.

This change has practical consequences. Res gestae, the common law doctrine that allowed certain statements made in connection with a transaction to be admitted as an exception to hearsay, is no longer separately applicable in Nigeria. Its content is now absorbed into section 4 of the Evidence Act 2011. We examine this in detail in the article on res gestae and section 4.

In the case of Onyeanwusi v Okpukpara,¹⁶ the West Africa Court of Appeal had remarked that it is the Evidence Act, or if it is silent, the common law of England that applies. That position has now been overtaken by the 2011 Act, which makes its own provisions supreme and leaves no room for the common law to fill gaps that the Act simply has not addressed.

A Quick Reference Table

Concept	Meaning	Key Section
Oral Evidence	Testimony given by a witness in court	Sections 125 to 126 EA 2011
Documentary Evidence	Evidence through documents	Sections 83 to 91, 128 to 130 EA 2011
Real Evidence	Physical objects produced for inspection	Section 127 EA 2011
Direct Evidence	Evidence that directly establishes a fact without inference	Section 126 EA 2011
Circumstantial Evidence	Evidence requiring inference to reach a conclusion	Not defined in Act; common law/case law
Primary Evidence	The original document itself	Section 86 EA 2011
Secondary Evidence	Copies or oral accounts of a document	Section 87 EA 2011
Hearsay	Out-of-court statement tendered to prove the truth of what it says	Section 37 EA 2011
Adjectival Law	Rules governing how substantive rights are proved in court	Entire Evidence Act 2011
Scope of Application	All courts except those in section 256(1)	Section 256(1) EA 2011
Constitutional Underpinning	Fair hearing, presumption of innocence, right to cross-examine	Section 36 CFRN 1999

Key Cases

Akintola v Solano (1986) 4 SC 141 The Supreme Court per Oputa JSC defined evidence as the means by which any matter of fact the truth of which is submitted to investigation may be established or disproved. This definition is the most frequently cited judicial definition in Nigerian courts.

Arum v Nwobodo (2013) 12 SCM (Pt. 3) 205 The Supreme Court defined evidence as the means employed for the purpose of proving a disputed fact. This is a useful shorthand for examination purposes.

Tukur v UBA (2012) 10 SCM 139 The court held that evidence is the means from which an inference can logically be drawn as to the existence of a fact. This definition captures the inferential dimension of evidence well.

Gwonto v The State (1982) NCLR 312 The Court of Appeal held that where a fundamental right enshrined in the Constitution has been denied, no other enactment can cure the illegality. This establishes the constitutional supremacy dimension of evidence law.

Onyeanwusi v Okpukpara (1953) 14 WACA 311 The court remarked that it is the Evidence Act, or if silent, the English common law that applies. This case illustrates the pre-2011 position and helps explain why the shift in section 3 of the 2011 Act is significant.

Problem Question Framework

When examination questions ask you to explain the law of evidence and its scope, or when a question involves a preliminary dispute about whether evidence should be admitted at all, use this framework.

First, identify what type of evidence is in question. Is it oral testimony, a document, or a physical object? The classification determines which specific provisions of the Evidence Act apply.

Second, ask whether the evidence is direct or circumstantial. If it is direct, the rules in section 126 apply. If it is circumstantial, the court must evaluate whether the inferences it raises are irresistible or at least reasonably compelling.

Third, ask whether the court hearing the matter is one to which the Evidence Act applies. A customary court is not bound by the Act in civil matters. An area court is bound only by certain provisions in criminal matters. If the court is a High Court or higher, the Act applies in full.

Fourth, ask whether any constitutional right is engaged. If the evidence was obtained by compulsion, if the accused was denied the right to cross-examine, or if the proceedings were held in private without justification, there may be a constitutional violation that makes the evidence or the entire proceeding defective.

Fifth, identify what the evidence is being tendered to prove. Evidence that is tendered for one purpose may be admissible for that purpose but not for another. This is particularly important in hearsay situations where a statement may be admissible to show that words were spoken but not to prove the truth of those words.

Common Student Mistakes

The first common mistake is using the word “evidence” and “the law of evidence” interchangeably. Evidence is the material. The law of evidence is the body of rules. Examiners notice this.

The second mistake is thinking that because something is relevant, it is automatically admissible. Relevance and admissibility are different concepts. A fact can be relevant but excluded by the law because its admission would violate a rule of privilege, hearsay, or character evidence. We explain the distinction in detail in the article on relevancy, admissibility and weight.

The third mistake is assuming that the English common law of evidence still applies whenever the Evidence Act is silent. Section 3 of the Evidence Act 2011 closes that door. The common law no longer fills gaps in Nigerian evidence law. Only other Nigerian legislation can do so.

The fourth mistake is forgetting the constitutional dimension entirely. Many students discuss the Evidence Act as if the Constitution does not exist. In any answer involving the rights of an accused, the right to cross-examine, or the admissibility of compelled statements, section 36 of the 1999 Constitution must be engaged.

The fifth mistake, and this is very common in problem questions, is treating the admissibility question and the weight question as the same thing. Evidence can be admissible but carry little weight, and the court will say so in its judgment. Equally, improperly admitted evidence may survive on appeal if a court determines that its admission did not cause a miscarriage of justice. These are distinct analytical steps.

---

Footnotes

¹ S Phipson, Phipson on Evidence (19th edn, Sweet and Maxwell 2018) para 1-01.

² J B Taylor, A Treatise on the Law of Evidence (12th edn, Sweet and Maxwell 1931) s 1.

³ T A Aguda, The Law of Evidence (4th edn, Spectrum Law Publishing 1999) 1.

⁴ J McKelvey, Handbook of the Law of Evidence (5th edn, West Publishing 1944) 1.

⁵ Akintola v Solano [1986] 4 SC 141, 184 per Oputa JSC.

⁶ Arum v Nwobodo (2013) 12 SCM (Pt. 3) 205.

⁷ Tukur v UBA (2012) 10 SCM 139.

⁸ Sir James Fitzjames Stephen, Digest of the Law of Evidence (12th edn, Macmillan 1936) art 1.

⁹ S A Fagbemi, Law of Evidence I: Lecture Notes (University of Ibadan, Department of Public Law 2021) 4.

¹⁰ Evidence Act 2011, ss 135 to 142; Constitution of the Federal Republic of Nigeria 1999, s 36(5).

¹¹ Evidence Act 2011, ss 122 to 124.

¹² Evidence Act 2011, s 82(1).

¹³ Evidence Act 2011, ss 83 to 91, 125 to 127, 128 to 130.

¹⁴ Evidence Act 2011, s 37.

¹⁵ Gwonto v The State (1982) NCLR 312 (Court of Appeal).

¹⁶ Onyeanwusi v Okpukpara (1953) 14 WACA 311.