Illinois Statutes Chapter 70. Special Districts § 1325/1. Park police powers

(a) Whenever any park district establishes a police force under Section 4-7 of the Park District Code,  1 each officer of that force is vested with police powers, is authorized to act as a conservator of the peace within that park district, and may arrest or cause to be arrested, with or without a warrant, any person who breaks the peace, or who violates any ordinance of a city, town, or village, or of the park district, or any criminal law of the State. If a park district maintains an airport, this authority also extends to any violation of a rule or regulation of a governing federal agency or any federal, State, or local law relating to that operation. The authority granted under this Section is expressly limited to park district property and shall not be construed to extend to any other jurisdiction except in cases of fresh pursuit or under a validly executed intergovernmental cooperation agreement.

(b) An arrest may be made by a park police officer without a warrant when a criminal offense is committed or attempted in his presence, or when a criminal offense has been committed and the officer has reasonable ground for believing that the person to be arrested has committed it. Any person so arrested shall, without unnecessary delay, be taken by the officer before the circuit court of the county having jurisdiction, and the officer shall file a complaint in writing under oath, charging the defendant with a violation of a statute or ordinance.

(c) A full or part-time police officer employed under this Section shall comply with the requirements of the Illinois Police Training Act. 2 In addition, before carrying a firearm, each officer shall complete a training course under the Peace Officer and Probation Officer Firearm Training Act. 3