I happen to know a person who experimented with eating dried caps and I don't think there exists a process that actually makes them harmless. Unless of course you're isolating muscimol, but I don't think that should count as eating the fungus.
While liver damage is mitigated by the fact that the organ in question regenerates, nerves don't.
I assume they have some method of keeping snails, woodpeckers and other animals resistant to the poison at bay.