In the continuing saga, my friend has been contacted by Manpower, the group who was finding work for him. They inform him that they will find it nearly impossible in the future, to represent him to any employer, as most of them disapprove of people bringing guns to work.
Note that "bringing a gun to work" was not in the description of what happened, and when the dust had settled, no charges were filed.
They leave the door open just enough of a crack as to avoid a lawsuit, but it's quite clear that he won't be getting any work from them any more.
And people ask me why I don't get a CCW?