special deputies, employed on a full time basis in the office of the sheriff.

Fund under Section 3-109.1 of this Code, and who is employed by a participating municipality to perform police duties.

basis by a Forest Preserve District, provided that such officer shall be deemed a “sheriff’s law enforcement employee” for the purposes of this Article, and service in that capacity shall be deemed to be service as a sheriff’s law enforcement employee, only if the board of commissioners of the District have so elected by adoption of an affirmative resolution. Such election, once made, may not be rescinded.

established under Article 3 of this Code who is employed on a full-time basis by a participating municipality or participating instrumentality to perform police duties at an airport, but only if the governing authority of the employer has approved sheriff’s law enforcement employee status for its airport police employees by adoption of an affirmative resolution. Such approval, once given, may not be rescinded.

who (i) is employed by a participating municipality that has both 30 or more full-time police officers and 50 or more full-time firefighters and has not established a fund under Article 3 or Article 4 of this Code and (ii) is employed on a full-time basis by that participating municipality to perform police duties or firefighting and EMS duties; but only if the governing authority of that municipality has approved sheriff’s law enforcement employee status for its police officer or firefighter employees by adoption of an affirmative resolution. The resolution must specify that SLEP status shall be applicable to such employment occurring on or after the adoption of the resolution. Such resolution shall be irrevocable, but shall automatically terminate upon the establishment of an Article 3 or 4 fund by the municipality.