70 ILCS 5/8.12
To police its property and to exercise police powers in respect thereto or in respect to the enforcement of any rule or regulation provided by the ordinances of the Authority and to employ and establish, maintain, and equip a security force for fire and police protection of a public airport and to provide that the personnel of the security force shall perform other tasks relating to the maintenance and operation of that airport. Such a security force shall not be deemed to be a regularly constituted police or fire department within the meaning of Sections 10-3-1 and 10-3-2 of the Illinois Municipal Code. However, members of such security force are conservators of the peace and as such have all powers possessed by policemen in cities, and sheriffs, including the power to make arrests on view or warrants of violations of federal and state statutes, city or county ordinances and rules and regulations of the Authority and governing federal agencies; provided, that they may exercise such powers only within the area of jurisdiction of the Authority when such exercise is required for the protection of Authority properties and interests, its personnel and persons utilizing its facilities, and otherwise, within such jurisdiction, when specifically requested by appropriate federal, State or local law enforcement officials. With respect to any security force established for police protection, the members of such security force shall be persons who have successfully completed an approved training course or approved training program offered at a police training school established under the "Illinois Police Training Act", as such Act may be now or hereafter amended. The members of such security force may not serve and execute civil processes.
70 ILCS 5/8.12