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I would suggest growing your own mushrooms as the safest way to be sure they aren’t tainted, it’s pretty easy (the hardest part is keeping things sterile) and you can grow quite a bit at once in a small footprint. In my jurisdiction it’s not even illegal so long as you destroy the final product upon maturity.
Destruction of the final product is also very easy, there are some strong chemicals capable of breaking it down in your own stomach.