ASADA has no hard evidence of a single player being administered with TB4.
a) You don't know that and
b) They don't need it, but in any case, from information that's in the public domain
c) They have it.
re c):
Dank confession
Players statements and consent forms
Injection schedules
Comfortable satisfaction.
(and that's without adding anything from Alavi/Charter or any other documentation and/or evidence/witnesses they may have).