Only one-tenth of a single percent of DNA (about 3 million bases) differs from one person to the next. Scientists can use these variable regions to generate a DNA profile of an individual, using samples from blood, bone, hair, and other body tissues and products.
Briefly, DNA collected at a crime scene is sampled and compared to information located in a database to determine who it belongs to and if there is anything else present. Speculation is then made over what occurred at the time of the crime, rinse and repeat.
Briefly, DNA collected at a crime scene is sampled and compared to information located in a database to determine who it belongs to and if there is anything else present. Speculation is then made over what occurred at the time of the crime, rinse and repeat.
Here are the two important papers that will solve your question and clear your doubts.
Article DNA typing in forensic science: I. Theory and background
https://www.ncbi.nlm.nih.gov/books/NBK234539/
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