1. crime scene
DNA based evidence has become a significant tool that many law enforcement investigators now have at their disposal. DNA evidence can definitively link a suspect to either a crime scene or victim. Nuclear DNA evidence has been recovered from blood, semen, saliva, skin cells and hair. Furthermore Mitochondrial DNA can be recovered from both bone and teeth dating back thousands of years. Laboratory analysis of DNA evidence generally involves the sample being amplified and quantified by a form of the Polymerase chain reaction known as Quantitative PCR or qPCR. (PCR) amplification of any sample recovered followed by sequencing via Capillary electrophoresis in order to obtain a DNA profile which can be compared to suspect DNA. DNA can also be extracted from animals and used to at least identify the species, for example bird or bat remains on an airplane or wind turbine.
2. paternity
By checking for similarities in DNA, scientists can conclude who a child's father is. Or, let's say for example, a man who has type AB blood could not father a child with type O blood, because he would pass on either the A or the B allele to all of his offspring. Despite their usefulness in this regard, ABO blood groups cannot be used to confirm whether a man is indeed a child's father.
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