Because the law prohibits any action which might have a "chilling" effect on the right of access to schools, districts must not require parents or adult care-takers to provide information concerning their or their children's immigrant status. Policies or procedures which condition services or benefits by requiring a child's or a parent's Social Security number must be amended because these practices have the effect of exposing the immigration status of undocumented students or their parents. If a number is needed for identification or administrative purposes, to avoid infringing upon undocumented students rights, districts should assign a school-generated identification number. Similarly, when implementing residency policies, care must be taken to ensure that parents indirectly, reveal their immigration status. Thus, districts may accept as proof of residency, but cannot mandate, that parents or adults caretakers provide either an Illinois driver's license or a state identification card which require Social Security numbers.