If I don't mistake, and you meant the ethnological researches, the key scientific criteria in ethnology are culture and self-identification. Why? "Blood" is very unreliable criteria. For example, we can consider the adoption of african boy by enlightened european family. Having adopted european culture and language, this boy can form as european man. After marriage with white girl its children will be 50 x 50% european on genotype, and 100% european on culture and self-identification.
Of course, the level of xenophobia/cultural empathy are very important parameters.
So, for my opinion, we must apply the following criteria:
Having been a Scientist in a very senior position in a highly reputed Govt organization I hope you are aware of the current scenario. Then why this question Sir?
In my perception one important factor can be benefit sharing in one way or other if one gets any benefits that must be shared with concerned community .
I am adding here two examples. Suppose I have published a new species in a least know local journal. If someone requests for the protologue of the name of the new species I immediately respond to the request. This is ethical. If I do not send, then it is unethical.
Similarly if there are ethical parameters in ethonobotany I am keen to know what are the unethical parameters?
Somewhere I read that Dr William Roxburgh never criticised any other botanist in his publications. In my opinion this is ethical. A renowned pteridologist criticises the Indian and Chinese pteridologists by name. It would have been ethical if that pteridologist would have given more emphasis in criticising the works instead of criticising the authors by name.