(20 ILCS 2610/10) (from Ch. 121, par. 307.10)
    Sec. 10. Except as provided in Section 9 of this Act, promotion of Department of State Police officers shall be made by the Director from those candidates who have been certified to him as being qualified for promotion. The Board shall make certifications for promotions on the basis of job performance measurement, seniority, education, or written or oral examinations. All vacancies in all ranks above the lowest shall be filled by promotion.
(Source: P.A. 84-25.)