1. No person may act as a security guard without first obtaining from the commissioner a license to be a contract security company.
2. This section does not apply to the following:
A. Any proprietary security organization or any employee thereof;
B. Any person employed by a person possessing a valid license to be a contract security company;
C. Any person possessing a valid contract security company license granted under any prior existing provision of law of this State, provided that upon expiration of that license the person shall be governed by this section.