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 NIJ Training Course for Forensic Analysts: Stochastic Effect

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 second learning module, 'Data Troubleshooting'. This brief animation shows an example of the Stochastic Effect.
  
  
          Transcript
0:00 Sometimes when an evidence sample contains very small amounts of DNA, the implication

0:06 process may not be completely successful, causing allelic pairs to be appear unbalanced.

0:12 Notice that the 2nd allelic pair all the way to the right is almost completely lost in

0:17 the evidence sample and a partial allelic dropout has occurred in both of the allelic

0:22 pairs to its left.
    
  
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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