745 ILCS 10/2-201
Except as otherwise provided by Statute, a public employee serving in a position involving the determination of policy or the exercise of discretion is not liable for an injury resulting from his act or omission in determining policy when acting in the exercise of such discretion even though abused.
(from Ch. 85, par. 2-201)
(Source: Laws 1965, p. 2983.)