625 ILCS 25/7
The Illinois State Police shall patrol the public highways and make arrests for a violation of this Act. Police officers shall make arrests for violations of this Act occurring upon the highway within the limits of a county, city, village, or unincorporated town or park district.
The State's Attorney of the county in which the violation of this Act occurs shall prosecute all violations except when the violation occurs within the corporate limits of a municipality, the municipal attorney may prosecute if written permission to do so is obtained from the State's Attorney.
The provisions of this Act shall not apply to a child passenger with a physical disability of such a nature as to prevent appropriate restraint in a seat, provided that the disability is duly certified by a physician who shall state the nature of the disability, as well as the reason the restraint is inappropriate. No physician shall be liable, and no cause of action may be brought for personal injuries resulting from the exercise of good faith judgment in making certifications under this provision.
625 ILCS 25/7