DNA can be interpreted to enable major breakthroughs in family history, but can also be over interpreted. There is no regulation or professional standard to rely on; it's caveat emptor.
BIFHSGO conference speaker Debbie Kennett has reproduced the full text of a letter which was published in part in the August Family Tree Magazine. http://cruwys.blogspot.co.uk/2014/07/my-letter-in-family-tree-magazine-about.html.
For a more comprehensive treatment see the website Debbie has worked on with colleagues at University College London: www.ucl.ac.uk/mace-lab/debunking.
What a wealth of info at these 2 sites! Thanks for bringing this to my attention.
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