This is what the media says, granted almost everything causes a false positive for pcp on immunoassay or dip tests. He did tell the police that god made him do it, which sounds pcpish. or just religious.
The few times I've smoked dust it just made me really heavy and Spacey. Kinda like dirty k feeling...I don't get how people can get all crazy wild on the shit but I guess that's why parke Davis pulled it from trials.