[JURIST] The Illinois Supreme Court [official website] reversed a $1 billion judgment against State Farm [corporate website] Thursday, ruling [summary; full text] that a class action should not have been certified in the case. In 1999, State Farm was held liable for using sub-standard parts in repairing policyholders' damaged vehicles. The state Supreme Court held that, due to differences in the plaintiffs' insurance policies, the cases were not similar enough to be part of a class. Additionally, only one named plaintiff was from Illinois and the court found he did not prove actual damages. AP has more.