No less than once per year, or upon completion of the project, every contractor shall provide a certified report to the public authority which let the contract. The report shall include:

1. (1) Information to show that the education and training service to the requirements of section five of this article was provided;
2. (2) The name of the laboratory certified by the United States Department of Health and Human Services or its successor that performs the drug tests pursuant to this article;
3. (3) The average number of employees in connection with the construction on the public improvement;

4. (4) Drug test results for the following categories including the number of positive tests and the number of negative tests:

   1. (A) Preemployment and new hires;
   2. (B) Reasonable suspicion;
   3. (C) Post-accident;
   4. (D) Random.