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Kenya

Criminal investigations in Kenya

The police investigate; the prosecuting authority decides whether to prosecute — with the distinctive feature that the prosecutor can direct the police to investigate.

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Criminal investigation in Kenya follows the common-law division of labour: the National Police Service investigates, and the Director of Public Prosecutions decides whether to prosecute and conducts the prosecution. What is distinctive is the link between the two — the Director may direct the Inspector-General to investigate an allegation of criminal conduct (Article 157(4)), while no one else may direct the Inspector-General about a particular investigation (Article 245(4)). So the prosecutor is the single office that can lawfully set a specific investigation going.

  • What is a criminal investigation?

    A criminal investigation is a legally authorised process for establishing whether an offence occurred and gathering evidence that can be tested in court. This guide explains its structure, safeguards, and known failure modes.

  • What is due process?

    Due process is the requirement that the state follow fair, established procedures before it takes action against a person. This guide explains what it typically includes and how it differs between systems.

Sources

Sources

  1. Constitution of Kenya, 2010

    National Council for Law Reporting (Kenya Law), for the Republic of Kenya · Legislation · 2010 · link verified 2026-07-27

    The Constitution of Kenya, 2010 (in force 27 August 2010), retrieved as the full official Kenya Law (National Council for Law Reporting) text and confirmed verbatim in two independent passes, including a direct read of the Fourth Schedule. Supports: Art. 1–2 (sovereignty of the people; the Constitution is supreme and any inconsistent law void); Art. 59 (the Kenya National Human Rights and Equality Commission, and 59(4) allowing legislation to restructure it into separate commissions — the hook for the KNCHR/NGEC/CAJ split, and 59(2)(h) the ombudsman-type function); Art. 156 (the Attorney-General as principal legal adviser, who does not conduct criminal prosecutions); Art. 157 (the Director of Public Prosecutions — 157(4) power to direct the Inspector-General to investigate; 157(5) a single non-renewable eight-year term; 157(10) not requiring any person's consent and not under the direction or control of any person or authority); Art. 160 (judicial independence — courts subject only to the Constitution and the law); Art. 162–163 (the superior courts and the Supreme Court as apex, bound-by rule 163(7)); Art. 165 (the High Court — 165(3)(a) unlimited original jurisdiction, 165(3)(d) jurisdiction to determine whether any law is inconsistent with the Constitution — diffuse constitutional review); Art. 170 (the Kadhis' courts, limited to Muslim personal-status matters where all parties profess Islam); Art. 171–172 (the Judicial Service Commission); Art. 243–246 (the National Police Service as one national service throughout Kenya, the two services, the Inspector-General's independent command under 245(2)(b), the direction firewall under 245(4), and the National Police Service Commission); and the Fourth Schedule Part 1 items 7 (police services, criminal law and correctional services) and 8 (courts), which place all four justice functions in the national government. Establishes constitutional supremacy and that, despite devolution to 47 counties, courts, prosecution, police and prisons are all national functions. WAVE 19 ADDITION, read from the same official Kenya Law text: Art. 50(4) in full — "Evidence obtained in a manner that violates any right or fundamental freedom in the Bill of Rights shall be excluded if the admission of that evidence would render the trial unfair, or would otherwise be detrimental to the administration of justice." Note the conditional structure: exclusion follows from a judgment about the effect of admitting the evidence, not automatically from the fact of the violation. WAVE 20 ADDITION. Read from the same official Kenya Law text. Supports Constitution of Kenya, 2010, Article 58(1): “58. State of emergency (1) A state of emergency may be declared only under Article 132 (4) (d) and only when— (a) the State is threatened by war, invasion, general insurrection, disorder, natural disaster or other public emergency; and (b) the declaration is necessary to meet the circumstances for which the emergency is declared.”. Supports Constitution of Kenya, 2010, Article 132(4)(d)-(e): “132. Functions of the President ... (4) The President may— (a) perform any other executive function provided for in this Constitution or in national legislation ...; (b) receive foreign diplomatic and consular representatives; (c) confer honours in the name of the people and the Republic; (d) subject to Article 58, declare a state of emergency; and (e) with the approval of Parliament, declare war.”. Supports Constitution of Kenya, 2010, Article 58(2)-(3): “(2) A declaration of a state of emergency, and any legislation enacted or other action taken in consequence of the declaration, shall be effective only— (a) prospectively; and (b) for not longer than fourteen days from the date of the declaration, unless the National Assembly resolves to extend the declaration. (3) The National Assembly may extend a declaration of a state of emergency— ... (b) for not longer than two months at a time.”. Supports Constitution of Kenya, 2010, Article 58(3)-(4): “(3) The National Assembly may extend a declaration of a state of emergency— (a) by resolution adopted— (i) following a public debate in the National Assembly; and (ii) by the majorities specified in clause (4); and (b) for not longer than two months at a time. (4) The first extension of the declaration of a state of emergency requires a supporting vote of at least two-thirds of all the members of the National Assembly, and any subsequent extension requires a supporting vote of at least three-quarters of all the members of the National Assembly.”. Supports Constitution of Kenya, 2010, Article 58(5): “(5) The Supreme Court may decide on the validity of— (a) a declaration of a state of emergency; (b) any extension of a declaration of a state of emergency; and (c) any legislation enacted, or other action taken, in consequence of a declaration of a state of emergency.”. Supports Constitution of Kenya, 2010, Article 58(6): “(6) Any legislation enacted in consequence of a declaration of a state of emergency— (a) may limit a right or fundamental freedom in the Bill of Rights only to the extent that— (i) the limitation is strictly required by the emergency; and (ii) the legislation is consistent with the Republic’s obligations under international law applicable to a state of emergency; and (b) shall not take effect until it is published in the Gazette .”. Supports Constitution of Kenya, 2010, Article 25: “25. Fundamental Rights and freedoms that may not be limited Despite any other provision in this Constitution, the following rights and fundamental freedoms shall not be limited— (a) freedom from torture and cruel, inhuman or degrading treatment or punishment; (b) freedom from slavery or servitude; (c) the right to a fair trial; and (d) the right to an order of habeas corpus .”. Supports Constitution of Kenya, 2010, Article 241(3); cf. Article 240(8): “(3) The Kenya Defence Forces— (a) are responsible for the defence and protection of the sovereignty and territorial integrity of the Republic; (b) shall assist and cooperate with other authorities in situations of emergency or disaster, and report to the National Assembly whenever deployed in such circumstances; and (c) may be deployed to restore peace in any part of Kenya affected by unrest or instability only with the approval of the National Assembly.”. CORRECTION TO A COMMON MISSTATEMENT, verified against the text: the escalating extension thresholds in Article 58(3) are TWO-THIRDS and then THREE-QUARTERS of all the members of the National Assembly, not two-thirds and then sixty-five per cent. Note also that Article 58(6) speaks of LIMITING a right rather than derogating from one, and that Article 25 lists rights that “shall not be limited” at all. This record supports the declaration, extension, review and limitation architecture; it records no state of emergency and supports no claim about any other country.WAVE 21 ADDITION. Read from the same Kenya Law text, Chapter Four article by article. Supports Art. 24(1), the limitation clause: a right shall not be limited “except by law, and then only to the extent that the limitation is reasonable and justifiable in an open and democratic society based on human dignity, equality and freedom, taking into account all relevant factors, including — (a) the nature of the right or fundamental freedom; (b) the importance of the purpose of the limitation; (c) the nature and extent of the limitation; (d) the need to ensure that the enjoyment of rights and fundamental freedoms by any individual does not prejudice the rights and fundamental freedoms of others; and (e) the relation between the limitation and its purpose and whether there are less restrictive means to achieve the purpose.” Supports Art. 24(2), which is the provision that distinguishes Kenya's clause from South Africa's: a limiting provision enacted or amended on or after the effective date “is not valid unless the legislation specifically expresses the intention to limit that right or fundamental freedom, and the nature and extent of the limitation” (24(2)(a)); shall not be construed as limiting unless clear and specific (24(2)(b)); and “shall not limit the right or fundamental freedom so far as to derogate from its core or essential content” (24(2)(c)). Supports Art. 24(3): “The State or a person seeking to justify a particular limitation shall demonstrate to the court, tribunal or other authority that the requirements of this Article have been satisfied.” Supports Art. 24(5), that legislation may limit the application of Arts. 31, 36, 37, 41, 43 and 49 to persons serving in the Kenya Defence Forces or the National Police Service. Supports Art. 27(1): “Every person is equal before the law and has the right to equal protection and equal benefit of the law.” Supports Art. 31 verbatim: “Every person has the right to privacy, which includes the right not to have — (a) their person, home or property searched; (b) their possessions seized; (c) information relating to their family or private affairs unnecessarily required or revealed; or (d) the privacy of their communications infringed.” Supports Art. 49(1), rights of arrested persons, including (a) to be informed promptly, in a language the person understands, of the reason for the arrest, the right to remain silent, and the consequences of not remaining silent; (b) to remain silent; (c) to communicate with an advocate and other persons whose assistance is necessary; (d) not to be compelled to make any confession or admission that could be used in evidence; (f) to be brought before a court as soon as reasonably possible but not later than 24 hours after being arrested, or the end of the next court day where the 24 hours end outside ordinary court hours; and (h) to be released on bond or bail on reasonable conditions unless there are compelling reasons not to be. Supports Art. 50(1), the right of every person to have a dispute resolvable by the application of law decided in a fair and public hearing before a court or, if appropriate, another independent and impartial tribunal or body. Supports the RIGHTS-HOLDER observation that these provisions are worded “Every person” and “An arrested person”. Constitutional text only — no decision of the Kenyan courts, no statute, nothing about any other country.