This is a result of circumstance: The nearest clinic is too far to reach in an emergency, so they naturally depend heavily on traditional Amerindian remedies.
當然，這也是情勢使然，散居在遙遠墨西哥沙漠間牧場的牧人們離最近的診所也有相當距離，急救時哪來得及，他們自然十分依賴就地可取的印地安傳統草藥。