This chapter shall not apply to the following:

(1) Staff meetings held for investigative purposes under duties or responsibilities imposed by law;

(2) The deliberations and voting of the State Board of Pardons and Paroles; and in addition said board may close a meeting held for the purpose of receiving information or evidence for or against clemency or in revocation proceedings if it determines that the receipt of such information or evidence in open meeting would present a substantial risk of harm or injury to a witness;

(3) Meetings of the Georgia Bureau of Investigation or any other law enforcement agency in the state, including grand jury meetings;

(4) Meetings when any agency is discussing the future acquisition of real estate, except that such meetings shall be subject to the requirements of this chapter for the giving of the notice of such a meeting to the public and preparing the minutes of such a meeting; provided, however, the disclosure of such portions of the minutes as would identify real estate to be acquired may be delayed until such time as the acquisition of the real estate has been completed, terminated, or abandoned or court proceedings with respect thereto initiated;

(5) Meetings of the governing authority of a public hospital or any committee thereof when discussing the granting, restriction, or revocation of staff privileges or the granting of abortions under state or federal law;

(6) Meetings when discussing or deliberating upon the appointment, employment, compensation, hiring, disciplinary action or dismissal, or periodic evaluation or rating of a public officer or employee but not when receiving evidence or hearing argument on charges filed to determine disciplinary action or dismissal of a public officer or employee. The vote on any matter covered by this paragraph shall be taken in public and minutes of the meeting as provided in this chapter shall be made available. Meetings by an agency to discuss or take action on the filling of a vacancy in the membership of the agency itself shall at all times be open to the public as provided in this chapter;

(7) Adoptions and proceedings related thereto; and

(8) Meetings of the board of trustees or the investment committee of any public retirement system created by Title 47 when such board or committee is discussing matters pertaining to investment securities trading or investment portfolio positions and composition.