Lil Wayne is handcuffed at Manhattan criminal court in New York, after being sentenced to a year in jail for having a loaded gun on his tour bus in 2007, March 8, 2010. (AP Photo/Louis Lanzano)
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One New York judge ruled the DNA evidence was scientifically sound.While many prosecutors and forensic experts hail it as powerful tool that can help close cases, critics – most notably the FBI – argue it is inconclusive and unreliable.With low-copy number DNA, the samples are so small – less than 100 picograms, or about 16 human cells – that scientists amplify them more than typical DNA samples and that's one of the reasons critics say the technique is troubling.Such concerns prompted the FBI to forbid laboratories to run low-copy number profiles through the national DNA database.A low-copy number DNA sample taken from the handle of a kitchen knife helped convict her but a forensic report in 2011 called the evidence unreliable and possibly contaminated, leading to the exoneration of both Knox and her co-defendant.Its forensic scientists have performed about 7,500 low-copy number tests since 2005 and have testified in close to 250 cases in state and federal court.
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