It is up to the physician to determine that. The physician carries out an assessment in every case.
Let me be clear. In the majority of cases where mental illness is the dominant factor, the health professional is likely to proceed much more cautiously and MAID will be slightly harder to access. Nevertheless, there is no reason to deny these people access to this care outright. While it may prove necessary to take more precautions, prohibiting access out of hand is unacceptable.