Hey Cath
Sadly this is typical addict behaviour again. Deny, avoid etc etc. Even in the face of a message.
The fact this is the second time he has met his dealer tells you all you need to know about how serious he is on recovering, he simply isn’t ready.
Tbh I don’t know much about testing, the absolute state of me told everyone all they needed to know when I was using, so I’m not sure what to advise on that.
Sounds like it’s make or break