Well its nice to hear someone who has experience dealing with a black market. That said, we do take everything we do very seriously as people's health is involved, as well as our own.
As far as MS goes, we have a line of samples we just got in that we will be sending out for testing. As of now Angus is doing the testing since he is one of few, if not the only, reliable tester available and Myth has fully backed the new lab he is using.
So this is not some 3rd party that you guys do not know about. Anyone is free to contact angus to confirm the results or ask questions about the results if they dont like them or have concerns about them.
This supplier was tested at a high purity on every batch by a vet about ~8 years ago and was recommended to us. From what I know, I believe he is a breakaway from a Chinese pharmaceutical company which may explain higher than norm purity.