It has been my experience that anyone anywhere can carry concealed without a permit, in the absence of a metal detector that is...
I saw one young man carry a semiautomatic in the national mall in the DC a few weeks back, I saw it while he was having his breakfast next to me at the McDonald's.
Back in the '70s, a friend and I used to go to the range in Colorado every Saturday morning. Both of us were carrying unconcealed. We'd stop in a diner for breakfast, cops would come in and get their coffee. No problem.
Other times we'd go to a terrific Japanes restaurant near Larimar Square in Denver, park in the back and have to walk down a dark alley. Both of us were packing Browning Hi-Powers.
Bottom line: times were different then, than now. It APPEARS that the pendulum is beginning to swing back to common-flippin-sense.