/jp/ - Otaku Culture

One thing I've been wondering about is criminal border prominently features some fairly brutal murders, rape, torture, and drug smuggling, but at no point do they EVER say a specific name of any drug and they refer to it as ぶつ almost exclusively and dance around the subject. Is there some kind of rule or regulation about the depiction of drugs in Japan? It just seems odd that you can show someone getting raped or murdered but not just say heroin or cocaine. Or maybe Fumi thought it would work better if he kept the drug ambiguous or he just doesn't know much about drugs.