35 Ill. Adm. Code 101.620
Interrogatories
Section 101
Section 101.620
Interrogatories
a) Unless the hearing officer orders otherwise, a party may serve
a maximum of 30 written interrogatories, including subparts, on any other
party, no later than 35 days before hearing.
b) Within 28 days after service, the party to whom the
interrogatory is directed must serve the answers and objections, if any, upon
the party submitting the interrogatories. Each interrogatory must be answered
separately and fully in writing under oath, unless it is objected to. Answers
must be signed by the person making them and objections must be signed by the
attorney making them or, if an individual represents himself or herself, the
individual making them.
c) Grounds for an objection to an interrogatory must be stated
with specificity, and be accompanied by a copy of the interrogatory. Any
ground that is not stated in a timely objection is waived unless waiver would
result in material prejudice or good cause for the delay is shown.