I've also found that it's not only the grieving who can feel dependent on the validation of an afterlife that mediums provide. Those, such as the infirm, geriatric or termionally ill who are confronted with their own mortality also particularly vulnerable.
The new consumer legislation has provission for business that target vulnerable sections of society. I've heard that people goign for one on one readings are now being asked to sign a disclaimer saying that they're not mentally ill. I can see good reason for this and encourage practicing mediums to take this seriously rather than considering it a pointless legal impediment. Consider that bereavement can indeed be a form of psychological impairment and recomned that they advise sitters not to try to conatact anybody within a year of their bereavement.