This is horrible. The program doesn't trust you. They have no personal reason not to trust you, it's just "policy", for reasons that are complicated -- but it's about their "policy", I guess, and not you.

They are not taking into account the "side effect" of their policy, and they definitely should. That policy has obviously triggered or generated a tremendous sense of shame for you. I hope that you can feel comfortable enough, or angry or assertive enough, to discuss this with your therapist. It's a bad, destructive policy on the part of the treatment program and they need to know. They may not listen but I think you need to tell them, if you feel able to.