15 ILCS 205/4d
The Attorney General may request and receive from employers, labor unions, telephone companies, and utility companies location information concerning putative fathers and noncustodial parents for the purpose of establishing a child's paternity or establishing, enforcing, or modifying a child support obligation. In this Section, "location information" means information about (i) the physical whereabouts of a putative father or noncustodial parent, (ii) the putative father or noncustodial parent's employer, or (iii) the salary, wages, and other compensation paid and the health insurance coverage provided to the putative father or noncustodial parent by the employer of the putative father or noncustodial parent or by a labor union of which the putative father or noncustodial parent is a member.
15 ILCS 205/4d