Potential risk of geology tracing and DNA collection being too accurate

Is anyone here worried about geology records and DNA collection becoming so advanced, people can be implicated in crimes in places they never visited. Example: You cough in public, someone steps on some spit that came out of your moth, goes to a place you have never been, gets murdered, that DNA links you to the crime and frivolous prosecutors who want their conviction number to be as high as possible proceeds with a case against you, even if your …

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