[Thamnophis]

I have seen it too, Rick.
On fresh shedded skins often are no mites.
Ik cannot say never, but I will try to take better looks in the future.
In our reptile zoo it is impossible to loose all mites. Often we get infected animals that are seized or found etc.
No problem, as long as you try to keep it under control.
We only use poison when the infection is very big and the animal is weak.