Texas Government Code - GOV'T § 402.028. Assistance to Prosecuting Attorneys

(a) At the request of a district attorney, criminal district attorney, or county attorney, the attorney general may provide assistance in the prosecution of all manner of criminal cases, including participation by an assistant attorney general as an assistant prosecutor when so appointed by the district attorney, criminal district attorney, or county attorney.

(b) A district attorney, criminal district attorney, or county attorney may appoint and deputize an assistant attorney general as assistant prosecutor to provide assistance in the prosecution of criminal cases, including the performance of any duty imposed by law on the district attorney, criminal district attorney, or county attorney.

(c) Nothing in this section shall prohibit an assistant attorney general from performing duties as an attorney representing the state under a temporary appointment described byArticle 2A.104, Code of Criminal Procedure.