Dark Side of truffles
I saw it - interesting stuff. According to the people interviewed in the segment, the Chinese truffles have "no perfume" and are thus quite distinguishable from the European ones. The lower price of the Chinese truffles is also a tip-off. You can watch it online if you missed it.
re: small h
What I gleaned from that segment is that much of the time unscrupulous folk are buying the Chinese stuff and packaging it in France, then labeling it "Product of France!" What they showed was canned truffle shavings, which I used to use frequently when I was catering. If the package is labeled incorrectly, the buyer wouldn't know until the can was opened. I'm guessing you'd know immediately, as I have never forgotten the unmistakable aroma of truffles when I opened those cans.