50 Ill. Adm. Code 8100.140
Information Unknown or Not Reasonably Available
Section 8100
Section 8100.140 Information
Unknown or Not Reasonably Available
Information required need be
given only insofar as it is known or reasonably available to the holder or
applicant. If any required information is unknown and not reasonably available
to it, either because the obtaining thereof would involve unreasonable effort
or expense, or because it rests peculiarly within the knowledge of another
person not affiliated with it, the information may be omitted, subject to the
following conditions:
a) The holder or applicant shall give such information on the
subject as it possesses or can acquire without unreasonable effort or expense,
together with the sources thereof.
b) The holder or applicant shall include a statement either
showing that unreasonable effort or expense would be involved or indicating the
absence of any affiliation with the person within whose knowledge the
information rests and stating the result of a request made to the person for
the information.