S.B. No. 1537 amends Article 38.30(a) of the Code of Criminal Procedure to clarify the process for appointing interpreters in criminal proceedings. The bill stipulates that when a motion for the appointment of an interpreter is filed, the court must determine if the person charged or a witness does not understand and speak English. If this is the case, an interpreter must be appointed in accordance with Section 57.002 of the Government Code. The bill also allows for any person to be subpoenaed or recognized to act as an interpreter under the same rules as witnesses, ensuring that the interpreting process is formalized and regulated.

Additionally, the bill addresses situations where the only available interpreter may lack adequate skills or familiarity with specific slang. In such cases, the court may permit the person charged or the witness to nominate another individual to serve as an intermediary between them and the appointed interpreter. This provision aims to enhance communication and understanding during criminal proceedings, ensuring that all parties can effectively participate in the legal process. The bill is set to take effect immediately upon receiving a two-thirds vote from both houses or on September 1, 2025, if that vote is not achieved.