Introduction
After the preliminary hearing, the prosecution formally opens its case by presenting witnesses to provide evidence supporting the charges against the accused. In criminal trials, the prosecution’s case is always initiated first.
Witnesses’ Oaths/Affirmation
The law mandates that all witnesses in criminal proceedings must testify under oath or affirmation, as required by Section 198(1) of the Criminal Procedure Act (CPA). This provision ensures that each witness gives evidence under the Oaths and Statutory Declarations Act [Cap 34 R.E. 2019]. Failure to comply with Section 198(1) leads to the evidence being dismissed. An exception to this rule is found in Section 127(2) of the Tanzania Evidence Act (TEA).
Examination-in-Chief
Examination-in-chief is the initial questioning of a witness by the party who called them. This stage allows the witness to present their account of events and submit exhibits according to the law, as provided under Sections 146 and 147(1) and (2) of the TEA. Leading questions are typically not allowed during examination-in-chief unless the court grants permission. The prosecutor must present witnesses logically to establish the case coherently.
Cross-Examination
Cross-examination, governed by Sections 146, 147, and 155 of the TEA and Section 290 of the CPA, is the questioning of a witness by the opposing party after examination-in-chief. The purpose of cross-examination is to obtain admissions that support the cross-examiner’s case, cast doubt on the witness’s testimony, or impeach the witness’s credibility. Effective cross-examination exposes falsehoods and strengthens the truth. The three primary goals are: (i) obtaining evidence that supports the cross-examiner's case, (ii) challenging the witness's accuracy, and (iii) discrediting the witness where appropriate.
Impeachment of a Witness’s Credibility Using Prior Statements
Impeachment using a witness’s previous statements requires the following steps under Sections 154 and 164 of the TEA: (1) reading the previous statement to the witness, (2) highlighting contradictions, and (3) submitting the statement as evidence.
Failure to Cross-Examine on Important Facts
Not cross-examining a witness on significant points implies acceptance of their unchallenged testimony, preventing the opposing party from later disputing it.
Re-Examination
Re-examination is conducted by the party who called the witness after cross-examination, focusing on clarifying matters raised during cross-examination. New issues introduced in re-examination may allow further cross-examination. Re-examination serves to resolve inconsistencies or clarify ambiguities.
Questions by the Court
The trial magistrate may ask questions for clarification either after the witness finishes testifying or, if necessary, during testimony.
Hostile Witness
A hostile witness shows bias against the party who called them. If a witness turns hostile, the calling party can request the court’s permission to treat the witness as hostile and cross-examine them. This request is subject to court discretion after considering objections from the opposing party. Hostile witnesses may face perjury charges.
Statements from Persons Unavailable as Witnesses
Under Section 34B(1) of the TEA, written or electronic statements from unavailable witnesses may be admissible if oral evidence would be allowed. For admissibility, conditions in Section 34B(2)(a)–(f) must be met.
Weight of Statements under Section 34B of TEA
Statements admitted under Section 34B of the TEA are considered reliable for conviction without needing corroboration. However, statements from absent witnesses may require corroboration for a conviction, potentially limiting the effectiveness of Section 34B.
Competence and Compellability of Witnesses
All persons are generally competent to testify unless the court finds them incapable due to factors like age, health, or mental state. Section 130(1) of the TEA specifies that a spouse may testify in cases involving offenses against the spouse, marriage laws, or certain personal offenses affecting family members.
Witness of Tender Age
Section 127(2) of the TEA allows a child under 14 years of age to testify without an oath or affirmation, provided they promise to tell the truth. The child’s apparent age determines their eligibility to give unsworn testimony.
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