The more frightening thing is if they have your DNA or the DNA of a relative, they can synthesize DNA and frame anyone for a crime.
Not only does this allow for framing, it can also be used to delegitimize valid convictions (past or future) by casting doubt on that forensic technique. Think same as the recent hype of Fake Videos (deepfakes) as pill planting to cast doubt on upcoming (maybe) incriminating videos.