There is always a risk of things like this. For example, to make my winecap bed, I had to get a bunch of woodchips. There is no way woodchips that one will buy in bulk are not contaminated with the spores of other wood-eating fungus.
What you learn is how to positively identify the mushrooms you intend to produce/eat. It doesn't take long. I've only had alien mushrooms show up once.
"I've only had alien mushrooms show up once" gonna be my reassuring quote of the day, thanks : )
Do people ever try to irradiate or fumigate or however they’d treat the woodchips?
Maybe it would cost 10 times as much as the wood chips themselves… small batch spore bakeoffs…
On the other hand, the morels that seemed to come with a load of wood chips were great for the year or two we had them.
I tried growing a little wine cap bed once, and it hadn't gone well. Perhaps it was the chickens pecking at it, can't say. I do still get wine caps on occasion, but they have migrated to more far-flung parts of the yard.