Polite requests.

As Glenn Reynolds is fond of pointing out, the courts follow where the culture leads. Hopefully it will not become the cultural norm to discourage personal carry of firearms.

Regarding the "please don't bring your guns to our store" thing: It starts with polite social disapproval... Ask smokers where it ends.
— Tamara K. (@TamSlick) September 13, 2014

Panera Bread and Target are making polite little coughing noises at you.
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