We had the same stuff in Portland, which I had analyzed no questions asked at OHSU after a cohort went off the deep end on it, and it proved to be PCP.

The Grand Jury investigating Portland drug use in 1970, reported that in the prevous 9 years, not under any circumstances did anyone arrested with what they thought was THC powder, ever actually have any. It was usually acid laced with something like strychnine or was PCP.

Personally I loved it, but wanted no further part of it, after discovering what it was and seeing what it did to my former associate.