Not sure why they wouldn't carry it necessarily, but yes - there is definitely some "controversial" material, depending on where you live. Discussions of drug use and manufacture, sexually explicit/pornographic material, discussions and outlines of actual occult rituals and references to "Satanic" ritual and sacrifice, conspiracy theory, scenes of sexual assault, torture, and lots of anti-church/anti-religious points of view. You know - stuff you can show on television in order to exploit, but can't discuss in a book in order to teach or dissect.
Try to find it wherever you can though. Definitely one of the most influential authors in my life.