Cabdriver Muhamed Mursal doesn't wear his Muslim beliefs on his sleeve, but he soon may broadcast them via a light on top of his cab. Mursal and hundreds of other Muslim cabdrivers at Minneapolis-St. Paul International Airport refuse to take travelers they know are carrying alcohol. No one is searching bags, but a Napa Valley wine box or a see-through bag from the duty-free store can be enough to leave a fare waiting for the next cab. Airport officials estimate that happens at least three times a day. Now, the airport and cab drivers have worked out a proposal that...