Bone Marrow Donors Risk DNA Identity Mix-up

Two possible scenarios in bone marrow transplants: 1) destruction the patient's own bone marrow by the new transplanted marrow; in such cases their blood will contain the DNA profile of the donor alone, or 2) some treatments in recent years retain some of the patient's original bone marrow, so their blood can contain a mixed DNA profile.
In a recent case in Alaska, forensic scientists saw a clear DNA match between semen from a serious sexual assault and a blood sample from a known criminal. But the criminal was in jail when this took place. After careful detective work, the mystery was solved: the jailed man had received bone marrow from the assailant many years earlier.

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