The present research paper reports a study of the law of evidence in relation to confession in Tanzania, confession has had its own history before and after colonialism, formally confession was extracted through various means including coercion, but later on the colonial regime imposed their law to regulate matters regarding confession and its admissibility. Despite of embodies some principles which guide confession and its admissibility, The law of Evidence Act [Cap. 6 R.E 2002] has contravened the administration of justice in a certain way such as in terms of taking confession and its admissibility since that it is the courts‘ duty to examine and evaluate the potentiality of confession. Hence, many institutes of law have underlined various principles governing confession and its admissibility for the sake of dispensing justice to the community at large. So the researcher has jotted down the rules of confession as provided. The aim of this research paper therefore is to retrieve the effectiveness of the law of Evidence Act [Cap. 6 R.E 2002] in relation to confession in Tanzania, and the study was carried out in the Tabora region which has one of the highest rates of criminal case. The style and language which has been used by the author is very attractive, hence it is simple for the readers to understand. It is my expectations that for any person who will constructively read this publication will sensitize his or her understanding over the matter particularly on the effectiveness of the law in relation to confession in Tanzania