Been keeping an eye out since reading this great article on the truffle industry (and how it's BS).
So far, 1 for 1. Here's a premium truffle product at an expensive SF boutique. Inspect tin, and it's tuber indicum, a cheap, tasteless truffle from China.
Do you know why? I'd naively expect that exposing them to a few tens of Gy of gamma radiation would sterilise them and won't change anything noticeable.