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In page Medicine man (Native American):

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Native Americans tend to be quite reluctant to discuss issues about medicine or medicine people with non-Indians. In some cultures, the people will not even discuss these matters with American Indians from other tribes. In most tribes, medicine elders are prohibited from advertising or introducing themselves as such.[citation needed] As Nuttall writes, "An inquiry to a Native person about religious beliefs or ceremonies is often viewed with suspicion."[6] One example of this is the Apache medicine cord or Izze-kloth whose purpose and use by Apache medicine elders was a mystery to nineteenth century ethnologists because "the Apache look upon these cords as so sacred that strangers are not allowed to see them, much less handle them or talk about them."[7]