The following is an excerpt.
[When it comes to solving crime] bigger is better. Add arrestee profiles to the database [of arrestee DNA], and more crimes will be solved.
Wrong. Research shows that bigger is only better if DNA databases grow in the right way: by entering more samples from crime scenes, not samples from arrestees. DNA databases already include 10 million-plus known offender profiles. But a database with every offender in the nation cannot solve a crime if no physical evidence was collected or tested. And police collect far too few such samples.
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