How does DNA testing for evidence work?

DNA is a molecule that contains our genetic code and determines all of our traits. Every cell in the human body contains a complete set of our DNA. 99% of the DNA from two people will be identical, 0.1% of the DNA code is what makes each person unique.

These sequences, genetic markers are used by forensic scientists when doing a DNA test. Identical twins will have identical genetic markets.

Forensic evidence could include samples from skin, hair, blood or other body fluids.

The accuracy of DNA is crucial as it can be life changing for someone on trial. DNA tests can sometimes be the only evidence to prove someone was involved in a crime or free someone wrongly convicted. Testing more markers will insure the accuracy of the test, but this can be expensive. Unrelated people can be the same, however this is only a one in one billion chance.

DNA was not used to profile people until the mid 1980’s. Compared to fingerprints or eyewitness testimony, DNA evidence is a high accurate method. DNA evidence is heavily relied on in court.

For more about DNA evidence in criminal law, check out these resources:
http://www.bbc.co.uk/science/0/20205874
https://criminal.findlaw.com/criminal-procedure/how-dna-evidence-works.html

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