Unfortunately they don't discuss how to check for quality, or or even define it, unless "garbage in, garbage out" counts, but I would think a panel of doctors could put out much more insightful info than this.
My expectations may have been too high... But based on the title I thought there might be some definitive information on extraction, purging, and consuming techniques so that a person could protect themselves from the 'possible dangers of bho'.
When I have time I will watch the whole vid and not just this part of it and maybe the info I'm looking for will be there...