Unless expressly exempted from the provisions of this act:
(a) It shall be unlawful for any person to engage in detective business in this state unless such person is licensed as a private detective under this act.
(b) It shall be unlawful for any person to engage in business in this state as a private detective agency unless such person is licensed therefor.
(c) No law enforcement officer or any person who holds a special commission from any law enforcement agency of the federal government or of the state or any political subdivision thereof may be licensed as a private detective or private detective agency.