14 Ill. Adm. Code 130.143
Information Unknown or Not Reasonably Available
Section 130
Section 130.143 Information
Unknown or Not Reasonably Available
Information required need be
given only insofar as it is known or reasonably available to the registrant.
If any required information is unknown and not reasonably available to the
registrant, 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 the registrant, the information may be
omitted, subject to the following conditions:
a) The registrant 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 registrant 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.