Recently bought some ketamine on alphabay. I've never even had k before. Came quickly enough and I tested it with mandelin reagent and it doesn't test positive as ketamine, does seem to test as mxe with a couple other tests.
Anyway I notify the vendor that im aware he's selling something bogus, politely, and he basically threatens to doxx me. Not in si many words but I believe that is what he's getting at. Not ready to reveal who it is yet but there aren't many us ketamine vendors.
only us k vendor i can think of is liston.