My wife and I took the green line this past Sunday night from Oak Park to Chicago to attend a concert at House of Blues(also posted GFZ). On our way into the city at one point a male nut job got on the train and began yelling and screaming that he was put in jail wrongfully, etc. Asking for money...Obviously he was not playing with a full deck or high or something. He got off at next stop without incident, but certainly got my heart rate and BP up. I felt completely helpless as I was not carrying at the time due to the CTA being posted as GFZ. This could have easily escalated and who is gonna help you...they gotta get ccw holders to be able to carry on the trains/buses...no such thing as GFZ in regards to criminals.