For four years, forensic scientists monitored Chris’s DNA samples. Within months, swabs from his arms, legs, body, and face had been replaced with his donor’s. Surprisingly, these results varied throughout the trial.

Some swabs included both Chris’ and the donor’s DNA. An even more startling discovery was that Chris’s sperm had its DNA replaced. Except for the hair on his breast and head, every part of his body had new DNA by the end of four years.