I highly doubt they will be asking to see people's permits. And no they dont have metal detectors. Those white arches you see at most big retailers are NOT metal detectors. I believe they are those RFID scanners which scan the signals being sent from those high end products that have a Radio Frequency Identificiation chip implanted in them.
I realize that on the scanners, but a metal detector, while being primitive, can be built right into the entrance door so that nobody knows it's even there. I'm not saying it will be done, but how many customers have been robbed or beaten at NFM that would require 6 armed wanna be cops?
I no longer have a need for Omaha or Lincoln anyway, so this has no bearing on me or my life. Buffet has more than likely been told that he is losing money by not allowing the legal, law abiding citizens of the country to shop in his establishment.
As it appears to be a win for the concealed carriers, the edge is intended for Buffet and nobody else. He isn't one that does favors or cares for the little people.