Before the Secretary reports any violation of this subtitle to any State's Attorney of the political subdivision in which the violation occurred for institution of a criminal proceeding, the person against whom the proceeding is contemplated shall be given reasonable notice of the alleged violation and an opportunity to present his views orally or in writing with regard to the contemplated proceeding. This subtitle does not require the Secretary to report for criminal prosecution violations of this subtitle if he believes that the public interest will be served adequately and compliance with the subtitle obtained by a suitable written warning notice.