it only matters if you’ve done somethign wrong and/or your dna may be at the crime scene.
Unfortunately DNA evidence is not as unique as commonly believed. The ‘99.9% unique’ figure often used is not applicable to the markers used to identify people.
The chances of a random DNA sample being similar enough to your’s to be counted as coming from you are worryingly high when considering the amount of faith put in DNA evidence for convictions.
This study is quite well documented…
State crime lab analyst Kathryn Troyer was running tests on Arizona’s DNA database when she stumbled across two felons with remarkably similar genetic profiles.
The men matched at nine of the 13 locations on chromosomes, or loci, commonly used to distinguish people.
The FBI estimated the odds of unrelated people sharing those genetic markers to be as remote as 1 in 113 billion. But the mug shots of the two felons suggested that they were not related: One was black, the other white.
In the years after her 2001 discovery, Troyer found dozens of similar matches — each seeming to defy impossible odds.