Probably pharmaceutical coke. Could be obtained from doctor or dentist. Clean. No drug dealers involved. Off the books of course.
What does that mean? There is no such thing, is there?
The cocaine is filtered through hydrochloric acid to get the salt, the white powder, which is 87% coke and 13 % hydrochloride. It is cut at each step of sale/transfer, ending up usually with a street product in the 10% range once again.....they say.
Mr biden junior likely has access closer to the source, hence the per cent is likely more than the pharmaceutical solution used by medical professionals legally.