(a) Employees working in high-risk jobs shall be subject to random testing for evidence of use of illegal drugs.

(b) The head of each state agency, department, commission, board, bureau, or authority shall determine those positions and groups of positions whose occupants regularly perform high-risk work where inattention to duty or errors in judgment while on duty will have the potential for significant risk of harm to the employee, other employees, or the general public. This Code section shall not be construed to include employees who do not regularly perform high-risk work regardless of the fact that other employees in the same classification do perform such high-risk work. With regard to positions covered under the classified service of the State Merit System of Personnel Administration, the department head shall consult with the commissioner of personnel administration before making such determination and shall notify the commissioner of any such determination.