If a patient/client/individual is in the hospital with acute PTSD, then it is a medical condition and it would be necessary to have a script. If seen in the community that says that the individual is stable enough to be in the community and therefore no script is necessary.
Not just PTSD but you can look at a variety of disabilities/diagnoses…Schizophrenia for example. Individuals who suffer from Schizophrenia can be stable and live/work in the community, attend groups in the community, etc.
If the patient deteriorates and symptoms occur, the OT or whoever is running the community based group/facility would contact the doctor, hospital, or the police.