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Most likely would be to test the hair for mDNA.How did the defense determine it to be familial female hair?
At the time of the crime, that was the type of DNA testing that could be done from any part of the hair and wouldn't require consumptive testing of the root.
Nowadays, they can get nuclear DNA from the shaft, but not then. There's a paper about doing it successfully a year after the crime.

Successful nuclear DNA profiling of rootless hair shafts: a novel approach - PubMed
Historically, rootless hair shaft samples submitted to a forensic laboratory for DNA analysis are reserved for mitochondrial DNA (mtDNA) analysis due to the presence of highly degraded as well as insufficient amounts of nuclear DNA. Although mtDNA has been very successful in obtaining results...

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