I wouldn't want them walking around the store in the daytime. Personally I wouldn't care but that seems to open some customers up to allergy issues and the cats up to increased danger (cars, general activity). Using them at night seems to be a great compromise. Both are nocturnal and the mice won't hang around too long if there are cats in the area.
The only issue I see is if a customer finds a mouse head. I would call that an acceptable problem.
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