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 NIJ Training Course for Forensic Analysts: Explanation of a Non-Match

September 9, 2020
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An interactive tool used to supplement the NIJ online training course entitled 'STR Data Analysis and Interpretation for Forensic Analysts', as outlined in the third learning module, 'Data Interpretation & Allele Calls'.
  
  
          Transcript
0:00 If the peaks on a known sample's electropherogram  do not match those of the evidence samples,

0:06 it is considered an exclusion or non-match  as long as the evidence sample is known

0:11 to contain only one person's DNA and  thereby display only one set of alleles.

0:17 Notice that some of the alleles might  match between the two samples. However,

0:21 all must match in order for the known not to be  excluded as a possible source for the evidence.
    
  
Disclaimer:
              Opinions or points of view expressed in these recordings represent those of the speakers and do not necessarily represent the official position or policies of the U.S. Department of Justice. Any commercial products and manufacturers discussed in these recordings are presented for informational purposes only and do not constitute product approval or endorsement by the U.S. Department of Justice.
  
Date Published: September 9, 2020
    
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