Any witness called to testify in a case is usually required to give his or her evidence on oaths or affirmation, the reason for which is to tell the truth. Judicial trials aim at unravelling the truth in each case to enable courts determine the appropriate punishments or remedies available to each party. A witness who lies on oath commits perjury. This Seminar Paper examines the use of oaths or affirmations in the judicial process. It seeks to answer the question of delay in administering criminal justice resulting from witnesses giving false evidence while testifying in criminal cases before the courts. It compares the English-type oaths with African Traditional Oaths. The doctrinal research methodology was used to collate and critically analyse relevant provisions of the Oaths Act, the Evidence Act, the ACJA 2015, judicial authorities, learned textbooks and articles. The Seminar Paper found out that witnesses usually resort to giving false evidence on oath because they are hardly tried and punished for perjury. It, also, found that witnesses or defendants who swear to African Traditional Oaths speak the truth for fear of consequences attending the oaths. It, therefore, recommends, among others, that witnesses should be committed for trials for perjury to serve as deterrence to other witnesses who might intend to mislead the trial courts by giving false evidence.