I was curious about this too. I found one article (by fox29) that states:
“Authorities later filed the drug offense filed after psilocin mushrooms were discovered during a search of his home.”
So the way I understand the situation is that he originally came in contact with Law Enforcement because of the racial slurs and such, after which a search of his residence was done (don’t know if related to the original charges), where they found magic mushrooms. The sentencing seems to be related to the latter.
I too would love more info on this case than is being reported.