An individual who has tuberculosis in a communicable stage may not work in any capacity in a public, private, or parochial school. A school employee may be required to furnish a current certification to the school administration that the employee is free of tuberculosis in a communicable stage. The health officer of a county or the Baltimore City Commissioner of Health may require an employee to furnish the certification when: The employee is first employed; and At any other time that the health officer or the Baltimore City Commissioner of Health deems necessary. This certification shall be based on results of specific tests. The types of tests and the intervals between these tests shall: Be regulated by the health officer or Commissioner; and Conform to the standards of the Maryland Department of Health.