The Best Source Of Human DNA

Question: What is the best source of human DNA?
Answer: Blood is an excellent source of human DNA. DNA is present in white blood cells of humans, but not red blood cells, which lack nuclei.

Another source is DNA from sperm heads, which is usually the most important source of DNA evidence for sexual assault cases. Saliva contains cellular material, so DNA can be extracted from bite marks, cigarette butts, postage stamps on envelopes, and envelope flaps for DNA analysis.

Yet another potential source of DNA is any body tissue that has not been degraded.

Bone is one of the best sources of DNA from decomposed human remains, even after the flesh is decomposed.

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Source: The Biology Project