Drawbacks
Common concerns about genealogical DNA test are cost and privacy issues (some testing companies retain samples and results for their own use without a privacy agreement with subjects). The most common complaint from DNA test customers is the failure of the company to make results understandable to them.
DNA tests can do some things well, but there are constraints. Testing of the Y-DNA lineage from father to son may reveal complications, due to unusual mutations, secret adoptions, and false paternity (i.e., the father in one generation is not the father in birth records). According to some genomics experts, autosomal tests may have a margin of error up to 15% and blind spots.
Some users have recommended that there be government or other regulation of ancestry testing to ensure more standardization.
Read more about this topic: Genealogical DNA Test
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