The Illinois Supreme Court issued five opinions on Thursday, June 20. The ISBA's panel of leading civil attorneys reviewed the opinions and provided summaries. In Nichols v. Fahrenkamp, the court took on the question of whether quasi-judicial immunity extends to court-appointed guardians ad litem in the context of the administration of funds from a personal injury lawsuit. The court dismissed a man’s class action lawsuit against Walgreens on the grounds that his claim was precluded under the voluntary payment doctrine in McIntosh v. Walgreens Boots Alliance, Inc. In County of Will v. Pollution Control Board, the court upheld the board’s determination that groundwater monitoring regulations were unnecessary to protect groundwater from clean construction and demolition debris and uncontaminated soil fill operations. In Ward v. Decatur Memorial Hospital, the court weighed in on whether res judicata bars a plaintiff from refiling an action because he voluntarily dismissed the third amended complaint after a circuit court involuntarily dismissed several counts from the original, first, and second amended complaints in the initial action. The court addressed whether a court may impose sanctions in the form of attorney fees under Illinois Supreme Court Rule 137(a) against a plaintiff to compensate an attorney defending himself against a frivolous cause of action in McCarthy v. Taylor.