In the United States, growing magic mushrooms is still illegal, in most parts, at least. However, as far as psilocybin spores are concerned, the situation tends to be slightly different. The fact is the psilocybin industry in the US is constantly evolving and always changing to meet the therapeutic necessities of our times.
To sum up, although mushrooms are illegal, the spores to grow them are legal in most states. The reason for that lies in the fact that magic mushrooms do not contain psilocybin in their spore state. Because of that, researchers need to make sure their spores do not germinate.
Psilocybin spores can be legally purchased, owned, and scientifically studied in most parts of the US. The laws governing this topic are pretty straightforward. Moreover, attempts to legalize psychedelic mushrooms have failed in many countries all around the globe.
Those who intend to use the psilocybin mushroom spores for scientific endeavors only have fewer problems related to the legal aspect of the whole process. In case of need, taxonomists and microscopists can check with local authorities if their spore research can have a lawful basis, and that is, in fact, the best and safest way to deal with such issues.