Earlier today, Governor Pat Quinn signed into law Senate Bill 1587, a measure that places appropriate and reasonable guidelines on the use of unmanned surveillance aircraft (drones) by state or local law enforcement agencies in Illinois. Most importantly, it requires police to obtain a warrant, subject to narrow exemptions, such as emergencies. It also limits retention and sharing of information collected by drones, and requires police departments with drones to publicly disclose the number of their drones.
Read more on the ACLU of Illinois blog.