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In addition to the state line confusion there are city and county regulations that must be considered as you travel with a gun. Even Colleges and Universities have their own carry laws that have landed well meaning parents visiting their child in hot water.
Currently, 23 states allow their college and universities to decide whether or not to allow concealed weapons on campus, according to the National Conference of State Legislatures. It reports that Utah is the only state that specifically prohibits its colleges from banning concealed carry.
Sources: Wikipedia, Law Center to Prevent Gun Violence