A general duty prescribed for an officer by Chapter 2A is not waived or excepted in any family violence case or investigation because of a family or household relationship between an alleged violator and the victim of family violence. A peace officer's or a magistrate's duty to prevent the commission of criminal offenses, including acts of family violence, is not waived or excepted because of a family or household relationship between the potential violator and victim.
Tex. Code Crim. Proc. § 5.03