Texas Code of Criminal Procedure - CRIM P Art. 38.46. Evidence in Prosecutions for Stalking

(a) In a prosecution for stalking, each party may offer testimony as to all relevant facts and circumstances that would aid the trier of fact in determining whether the actor's conduct would cause a reasonable person in circumstances similar to the circumstances of the alleged victim to experience a fear described by Section 42.072(a)(3)(A), (B), or (C), Penal Code, including the facts and circumstances surrounding any existing or previous relationship between the actor and the alleged victim, a member of the alleged victim's family or household, or an individual with whom the alleged victim has a dating relationship.

(b) This article does not permit the presentation of character evidence that would otherwise be inadmissible under the Texas Rules of Evidence or other applicable law.