Tex. Health & Safety Code § 242.261 – Evidence

(a) The department or the institution may offer evidence as they desire and shall produce additional evidence as the arbitrator considers necessary to understand and resolve the dispute.
(b) The arbitrator is the judge of the relevance and materiality of the evidence offered. Strict conformity to rules applicable to judicial proceedings is not required.
Redesignated from Health and Safety Code, Subchapter J, Chapter 242 by Acts 2011, 82nd Leg., R.S., Ch. 91 (S.B. 1303), Sec. 27.001(26), eff. September 1, 2011.