Texas Government Code - GOV'T § 571.097. Defenses:  Reliance on Advisory Opinion;  Commission's Failure to Issue Opinion

(a) It is a defense to prosecution or to imposition of a civil penalty that the person reasonably relied on a written advisory opinion of the commission relating to the provision of the law the person is alleged to have violated or relating to a fact situation that is substantially similar to the fact situation in which the person is involved.

(b) It is a defense to prosecution or to imposition of a civil penalty for the violation of a law that:

(c) The defense to prosecution or imposition of a civil penalty under Subsection (b) applies only to acts giving rise to a potential violation of law occurring in the period beginning on the date the time prescribed by Section 571.092 expires and ending on the date the commission issues the requested opinion.