The importance of research focused on the applicability of TST Summary 357 is intended to resolve points that still have doctrinal divergences. Therefore, this article aimed to verify: how does the applicability of Summary 357 of the TST occur regarding the use of witness evidence in the Labor Court? Therefore, the objective was to analyze the essence, object, applicability and doctrinal divergences on the aspects that involve TST Summation 357. Thus, what is intended with this work, in a broad sense, is the understanding of the general aspects of Labor Law and the Labor Process, emphasizing the importance of the use of witness evidence in the Labor Court and proposing a more complete analysis on the suspicion of the witness. More specifically, it is intended to focus on aspects related to Summary 357 of the TST, bringing a reflection about its implication, applicability and non-applicability, in order to resolve practices related to the theme exposed. Aiming, also, a critical focus on doctrinal understandings and the understanding currently defended by the Superior Labor Court. In addition, it seeks to demonstrate the evolution of such positioning, concluding, therefore, with the ratification of Summary 357 of the TST and the defense of the points that characterize the non-applicability of this Summary.