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Even in identical twins, fingerprints are unique.
Motives would also aid in the investigations.
Alibis come into play as well.
Rarely do police rely just on DNA evidence, secondary to the fact that they have to catch the bad guy to test the DNA.
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The sad thing is... as you get older you come to realize that you don't so much pilot your life, as you just try to hold on, in a screaming, defiant ball of white-knuckle anxious fury 
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