14 Ill. Adm. Code 135.2143
Information Unknown or Not Reasonably Available
Section 135
Section 135.2143Â Information
Unknown or Not Reasonably Available
Information required need be
given only insofar as it is known or reasonably available to the applicant. If
any required information is unknown and not reasonably available to the
applicant, either due to unreasonable effort or expense, or because it rests
within the knowledge of another person not affiliated with the applicant, the
information may be omitted, subject to the following conditions:
a)Â Â Â Â Â Â Â Â The 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)Â Â Â Â Â Â Â Â The 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.