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Stated he found neither zimmerman's dna under martin's fingernails nor martin's under the pistol grip. >> you were able to exclude trayvon martin from having dna on the pistol grip. >> yes. >> exhibit 169 -- >> reporter: the defense countered by exploring external factors that could have limited dna findings. >> so, for example, if the collection was just not a good job, there could be dna that was missed and you wouldn't know that. >> potentially. >> reporter: today prosecutors are expected to call their final witnesses including trayvon martin's mother, before they rest their case. >> they'v...

Stated he found neither zimmerman's dna under martin's fingernails nor martin's dna on the pistol grip of zimmerman's gun. >> and you were able to exclude trayvon martin from having dna on the pistol grip. is that correct? >> yes. >> exhibit 169 -- >> reporter: the defense countered by exploring external factors that could have limited dna findings. >> so, for example, if the collection was just not a good job, there could be dna that was missed and you wouldn't know that. >> potentially. >> reporter: today prosecutors are expected to call their final witnesses including trayvon martin's mothe...