I'll pipe in here just to add that in some areas of the country (not all sure about your place, though) the library is considered a government building and here in Indiana, I believe, that there are restrictions on carrying in a government building. In my library we have a policy stating that no weapons are allowed, however, I have yet to have this be an issue and I know for certain that there are people who have carried concealed in our building. Generally, if you don't make an issue out of it, we won't make an issue out of it.