If the Director of the Department of Food and Agriculture finds that the above conditions have been met, he/she shall issue a letter to the district attorney authorizing the district attorney or employees of the district attorney to inspect the records of those weighmasters to determine the number and extent of violations of Division 15, Chapter 5, Article 1 of the California Vehicle Code that may exist, related to the named company, covering a period of 30 days prior to and 30 days subsequent to the issuance of the identified citation.