IL HB5231

Authorizes law enforcement agencies to use automatic license plate reader (ALPR) systems only for criminal investigations with reasonable suspicion, active missing/endangered person cases, human trafficking investigations, and notifications about outstanding warrants or stolen vehicles/plates.

Requires system data to be purged after 21 days and audit trail data after 2 years from capture date.

Designates the Chief Procurement Office for General Services as the authority to approve ALPR systems for use statewide, with law enforcement agencies able to contract with vendors for approved systems.

Establishes that an ALPR notification alone does not constitute reasonable suspicion to stop a vehicle, and makes willful misuse or unauthorized sharing of ALPR data a Class 1 misdemeanor.

Mandates law enforcement agencies report ALPR usage to Illinois State Police, the Governor, General Assembly, and Illinois Criminal Justice Information Authority, and requires public awareness measures about ALPR use.