Tex. Code Crim. Proc. art. 24.02
Current with legislation from the 2023 Regular and Special Sessions signed by the Governor as of November 21, 2023.
If a witness have in his possession any instrument of writing or other thing desired as evidence, the subpoena may specify such evidence and direct that the witness bring the same with him and produce it in court.
Tex. Code Crim. Proc. § 24.02