Appartently Ms. Winehouse had purchased ecstasy, cocaine and ketamine on the night before her death.
DonDiego is familiar, . . . umm, that is, . . . DonDiego has heard of ecstasy and cocaine before; in fact, once in an online chatroom a young fellow inquired where he could get some "X", and DonDiego replied that he could get a dozen at Albertson's for 99-cents. The young lad thought DonDiego was funny. But DonDiego digresses . . .
Ketamine is a "dissociative anaesthetic", . . . in the same classification as PCP, DXM and nitrous oxide (laughing gas). The interested reader can learn all one needs to know at this web-site which "promotes health and safety within the rave and nightclub community": dancesafe.org