Subchapter XX-B. Mandatory Drug and Alcohol Testing of Certain Employees of the Department of Human Services and the Commission on Mental Health Services. § 1–620.21. Definitions. § 1–620.22. Employee testing. § 1–620.23. Testing methodology. § 1–620.24. Implied consent of employees who operate motor vehicles. § 1–620.25. Procedure and employee impact.