(a) The director shall create divisions within the Department of Public Safety as shall be necessary. The divisions shall include all of the following:
(1) An administrative division.
(2) A highway patrol division.
(3) A driver's license division.
(4) A service division.
(5) An investigative division, to be named the Alabama Bureau of Investigation.
(b) Notwithstanding any other provision of law, after July 1, 2006, any person employed by the Department of Public Safety as a law enforcement officer or a trainee to be a law enforcement officer shall be 18 years of age or older.