DNA tests that arrive in the mail, including Ancestry DNA and 23&me, are exposing the uncomfortable extent of incest in the US. The tests, which run for about $100, can't say explicitly whether someone is the product of incest, but the results can be taken to a third party genetic testing firm which can. One person who found out the disturbing truth about her family history was 39-year-old Victoria Hill, who, at a high school reunion, got chatting about family trees with an ex-boyfriend with whom she was once intimate.
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