I would advise you not to go into details in any public venue.
Having used meth (or other drugs for that matter) does not necessarily make someone incapable of making decisions nor does sobriety mean that you are capable of making decisions. Assessing mental capacity and therefore the ability to make decisions can be very difficult and complex.
Unfortunately the state of Texas has made assessing mental health and the placement of emergency holds more difficult than it needs to be, and muddies the water quite a bit.
If you carry personal liability insurance most companies have a legal resource available that maintains a legal privilege and are not subject to subpoena. Otherwise almost anyone else can be called as a witness. Even for protected avenues like peer review (of which I'm not sure where Texas stands), I am still obligated to report reckless or other illegal behavior to the state.