The Criminal forensic Genetics Division at the NIPH does more than 8,000 DNA tests yearly, to rule out suspects in criminal cases. DNA testing is a procedure that is carefully handled, but even with a high level of caution there are weaknesses in the DNA testing system. DNA can be accidentally transferred, so the police can’t always know for sure whether the DNA collected was left from the crime scene. Also, DNA can be mishandled when proper procedures for handling evidence haven’t been followed. Timing is also an issue with the DNA testing. If the suspect and the victim were familiar with each other then the DNA could’ve been left there before the crime. While at one time police needed samples of DNA visible by the naked eye, now technology improved so much that tests can be done on material that is invisible to the naked eye. Overall we need to remember how DNA can help an investigation, but we also need to remember there is always other evidence that needs to be considered.
For the full article with more information go to: http://www.realclearscience.com/articles/2016/10/22/dna_evidence_is_far_from_foolproof_109788.html
Author: Sophia Kudratov
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