Cutiekitty
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Or another possibility, LE believe they have the suspect’s DNA but they were only able to obtain a partial profile.
BBM
“......DNA profiles are often not clean enough to conclusively identify an individual. Ideally, a DNA sample would be complete enough to examine at least 16 different “markers,” points at which an individual’s DNA fingerprint can be sketched out. But when DNA is damaged, as it often is through exposure to moisture or extreme temperatures, only some of these markers will be available, and forensics teams will generate a partial profile. Put simply, if a DNA profile is a complete description of a person’s appearance, a partial profile might describe only one of their traits—hair color, for instance....”
How Forensic DNA Evidence Can Lead to Wrongful Convictions | JSTOR Daily
Also true and I wouldn’t be surprised if that is the case.