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There's no good reason to extract all of it (this would of necessity kill the person, and if that's the goal there are much simpler ways of doing it).

A small sample of DNA might be obtained for a number of reasons, including:

* Screening for genetic risk factors (to see if the subject is likely to develop certain types of cancer, or if they have hereditary defects they could potentially pass on to offspring)

* Identification (comparing DNA from the subject to DNA found at a crime scene)

* Paternity (or maternity, though that's usually more obvious) testing (comparing the DNA of a child to that of a purported parent)

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Q: What are three reasons to extract DNA from a human subject?
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