If the district attorney, during the course of any investigation made by him pursuant to this article, determines that any person has committed any act or has omitted the performance of any duty, which act or omission causes or tends to cause or encourage any child receiving aid under this chapter to come within the provisions of Sections 300, 601, or 602 of this code, the district attorney shall prosecute such person under the provisions of Section 272 of the Penal Code.