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A test that comes up blank doesn't prove a particular person innocent.
A test that comes up with a real match to an unknown DNA profile may exonerate a suspect, but if there's multiple rapes involved (i.e. a woman says she was screwed by two guys) then all DNA testing can do is count people IN.
Think of it like fingerprints - find a print and you know that the owner of the print was certainly there. Find nothing and you know nothing.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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