They would probably need to know a Navajo closely in order to get any help. Being non-Navajo could have language barrier problems as well as the improbability of even knowing who would be the local medicine man and so on. Considering that street names are rare on the reservation, it's not like one can look up "medicine man" in a phone book and get an appointment in. I can't say for sure what would be done for them. I do think it would be unlikely that they would be turned away by a medicine man, if the problem was valid, the medicine man approached properly and through a Navajo intermediary. I am not positive, however. I could be totally wrong. I know that there is alot of concern in regards to "new agers" wanting ceremonies for wrong reasons so it's really hard to say. It would depend on the victim(s) and their relationships with Navajo families would be my guess. I can't quite see a non-Navajo coming onto the reservation and demanding a medicine man and ceremonies going over too well though.
Visitations are most common on the reservation itself. Most people in the border towns, even, don't really have much to worry about. If a non-Navajo family were to be visited, they'd probably be living on the reservation and are friends with at least one Navajo. The lines get really blurred out here and very seldom is race an issue. most caucasians living on the reservation are either teachers or doctors and well respected for it. I don't think they'd be turned away.
Stephanie
In every man there is something wherein I may learn of him, and in that I am his pupil.--Ralph Waldo Emerson