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The Lydia Fairchild case (Washington state woman - The Case of Lydia Fairchild and Her Chimerism (2002) | Embryo Project Encyclopedia ) is fascinating to me. In a criminal sense, chimeras (organisms, including some humans that have two different sets of DNA, or the genetic material that contains instructions for the development and functioning of an organism, present in their bodies - What Is Chimerism?) would make it nearly impossible to identify suspects via DNA. This article from NIH discusses its ramifications in forensic science. The impact of chimerism in DNA-based forensic sex determination analysis - PMCDNA mismatches:
Washington state woman had two children with not the same DNA as her. Court case attempting to take her children. She was pregnant with third child, and jury members watched the birth. Same results. Not her DNA. Jury actually accused her of being a surrogate. Enter DNA specialist. Woman had two DNA present in her body. She kept her children.
DNA accused man of murder, but he was 100% in prison at time of murder. He had a twin. Identical twin's DNA did not match his either. Prosecutors had no idea. Dropped charge.
Alaska man needed a bone marrow transplant, but he had atypical DNA. Match found in Germany. Surgery to his arm. Four years later the man had completely become the donor's DNA - completely.
It's VERY statistically unlikely that NG's perp has this condition, but it is possible. JMO.