44 Ill. Adm. Code 5010.680
Trade-Ins
Section 5010.680 Trade-Ins
a) Transferable equipment may be "traded in" by
agencies as part of the purchase price of new equipment of a "like
nature".
b) "Like nature" means items that are of the same type
or so closely related in structure, quality or use as to be the same type as
the equipment traded.