The case of Chris Long, from Nevada, has piqued the interests of forensic scientists for its implications.
Long, who worked at the Washoe County Sheriff's Office, was suffering from acute myeloid leukemia and myelodysplastic syndromes and had been scheduled to have a bone marrow transplant. One of his colleagues, Renee Romero, suggested he take DNA samples ahead of the operation to see what changes would take place.
Just three months after the operation, tests showed how the DNA in his blood had been replaced with his donors. And the changes continued over time. Samples taken from his tongue, cheek and lip all contained donor DNA. Four years after the transplant, the team found his semen only contained DNA from his donor—a man from Germany.
His case was presented at an international science conference in September and has gained interest among researchers, raising questions about forensic evidence at crime scenes. According to the newspaper, there have been several cases where DNA evidence did not add up and it later emerged a person involved had had a bone marrow transplant.
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