From: keith_nuttle@sbcglobal.net   
      
   On 11/17/2019 8:34 AM, MB wrote:   
   > On 17/11/2019 12:55, knuttle wrote:   
   >> This thread has talked a lot about DNA and the fact that the test    
   >> method is new.  Blood type has been mentioned and everyone seems to    
   >> think of it as an old technique.   The typing of blood was only    
   >> discovered a little more than 100 hears ago.  So if you have developed    
   >> family tree of any size, none knew their blood type let alone had the   
   >> concept of blood type.   
   >>   
   >    
   >    
   > DNA within a family is difficult.   
   >    
   > Don't forget that a married couple in the UK nearly spent a long time in    
   > prison because the body of a baby found at their house matched the    
   > wife's DNA so they were obviously guilty of killing it.   
   >    
   > They were very lucky being able to prove that they were out of the    
   > country when it had been born and killed / died.  Further investigation    
   > suggested it highly likely that the wife's mother was guilty even though    
   > she had died by then.   
   >    
   > There was no doubt that they would have been convicted because DNA    
   > cannot be wrong - statistics like one in x billion chance impress juries.   
   >    
   >    
   >    
   DNA was not wrong, just miss interpreted.  DNA said the baby was a    
   member of the wife's family, it was.  However DNA can not determine the    
   exact generation when the match occurs, and the court did not consider    
   the supporting evidence.   
      
   As genealogist we also do the same thing. We consider a DNA match proof    
   of a relationship but forget the document that supports the DNA match.   
      
   I have many DNA matches that I have ignored.  The match is with a person   
   who has a couple of generation in their tree, and the match predicts a    
   match several generations before the first generation in their tree.  I    
   don't feel I have the time to explorer their family when I have better    
   matches.   
      
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