(CBS News) European white truffles can sell for as much as $3,600 a pound, making them and their fellow fungi the most expensive food in the world. One two-pound truffle recently sold for more than $300,000. All of which has brought organized crime into the truffle trade, creating a black market and leading to theft of both truffles as well as the highly valued truffle-sniffing dogs. Add to that the influx of the inferior Chinese truffles -- masquerading as their European cousins -- and you've got trouble with truffles. Lesley Stahl reports.