“Police officer” means a member who is:
1. Filling a full-time position with a participating public employer, the principal duties of which require emotional stability and physical capacity in protecting the public and enforcing the laws of the State of Nevada or any of its political subdivisions.
2. The former holder of a position defined in subsection 1 who has:
(a) Earned at least 2 years of creditable service in that position; and
(b) Been promoted or transferred within the chain of command by the same public employer to a position related to the protection of the public and law enforcement.
3. The former holder of a position defined in subsection 1 who:
(a) Has earned at least 2 years of creditable service in that position; and
(b) Is employed by a different employer in a position that would have been eligible under paragraph (b) of subsection 2 had the member remained with the member’s former employer.