It probably doesn't happen, but we can only hope. I've been a Chicago resident for 30+ years and in the past 5 years have never felt less safe, can we please just pass this law?
http://chicago.cbslocal.com/2012/12/11/chicago-concealed-weapons-ban-tossed-by-court/
http://chicago.cbslocal.com/2012/12/11/chicago-concealed-weapons-ban-tossed-by-court/