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Why I regret using 23andMe: I gave up my DNA just to find out I’m British | Technology | The Guardian
(www.theguardian.com)
This is a most excellent place for technology news and articles.
That default to suspicion/accusation is why fathers don't have real rights in this matter.
As it only requires saliva, any father can test their child’s DNA. Babies drool a lot. It may cost a few hundred dollars to do so. I suppose that makes it even less trusting to do it in secret than just having it as standard medical procedure.