So yes, there was an informant who was cited as the reason for the warrant, but the credibility is questionable. The informant referenced a basement that county records would show should not have existed - presumably the SWAT-like team doing the raid didn't bother to consult building plans for any planning, because that would have cast all the testimony into doubt.

This part I've heard from social media sources and haven't seen in reputable documents, but some of Afroman's claims about the police officers and their history of sexual abuse is apparently based on claims from the same informant that were never investigated.

The whole thing stinks and I'm glad attention has been thrown on that department.