The commissioner may refer the evidence that is available concerning any violation of this law, or of any rule or order under this law, to the Attorney General or the district attorney of the county in which the violation occurred, who may, with or without such a reference, institute appropriate criminal proceedings under this law. The commissioner and the commissioner’s counsel, deputies, or assistants may, upon request of the Attorney General or the district attorney, assist the prosecutor in presenting the law or facts at the trial.