Associated Press: Philippe Daniel opens a slim briefcase so buyers can glimpse his wares, then snaps it shut with a wary glance over his shoulder. Daniel is not dealing in drugs, counterfeits or other illicit goods, but in truffles aromatic tubers prized for their heady fragrance and rich, earthy flavor. One of the world’s most sought-after gastronomical treasures, truffles fetch astronomical prices, and sellers like Daniel are always alert for spying competitors. Daniel used to deal in big …