"This bill in no way limits the use for important law enforcement needs. What it does is ensure that the privacy protections afforded to us under the Constitution -- under the First and the Fourth Amendment -- are intact." - Rep. Ann Williams
The law has several exemptions. Warrants wouldn't be required for searches for missing people, when someone is in imminent danger, or when the federal government identifies a credible terrorist threat. Illinois Public Radio's Brian Mackey contributed to this report.