20 ILCS 2615/2
The Illinois State Police, the county board of any county, the city council of any city and the board of trustees of any village or incorporated town are authorized to purchase or acquire and furnish radio receiving sets to all peace officers under their jurisdiction. These radio receiving sets shall only be used by such officers in the performance of their duties as police officers in this State and shall always be set and in readiness to receive any report or message that may be broadcasted from any radio broadcasting station operated by the Illinois State Police under this Act. Every police officer receiving a radio set shall make a report to the Illinois State Police at such times and containing such information as the Illinois State Police may require.
20 ILCS 2615/2