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If you're such a hot shot expert -- >> right. and -- >> reporter: how does this error creep in? >> and he said, "well, it was a mistake." >> reporter: the same went for the dna evidence, attack the credibility of the analysis. the defense said the dna results, returned within a few days, were rushed through the police lab because of rothstein's connections. attorney fleisher also suggested there could have been cross contamination to tilt the scale so the results pointed at tony. >> our goal was to educate the jury on the rothstein connections, and the rothstein influence. >> reporter: had med...

Evidence, the cellphone first. lawyer fleisher found a mistake in a chart the state's expert had used. was the expert analysis, in fact, sloppy? if you're such a hot shot expert -- >> right. and -- >> reporter: how does this error creep in? >> and he said, "well, it was a mistake." >> reporter: the same went for the dna evidence, attack the credibility of the analysis. the defense said the dna results, returned within a few days, were rushed through the police lab because of rothstein's connections. attorney fleisher also suggested there could have been cross contamination to tilt the scale so...

In a chart the state's expert had used. was the expert analysis, in fact, sloppy? if you're such a hot shot expert -- >> right. and -- >> reporter: how does this error creep in? >> and he said, "well, it was a mistake." >> reporter: the same went for the dna evidence, attack the credibility of the analysis. the defense said the dna results, returned within a few days, were rushed through the police lab because of rothstein's connections. attorney fleisher also suggested there could have been cross contamination to tilt the scale so the results pointed at tony. >> our goal was to educate the ju...