profile from trayvon martin. in a sample like this, i call this an intimate sample. because it's collected directly from an individual's body. when you collect a sample from an individual's body, their dna profile is expected to be seen on that swab or on that sample. so what i'm looking for on an intimate sample is anything foreign to that person. and in this case, because the dna profile matched trayvon martin, that means there were no dna foreign to him on that sample. >> in other words, from the right fingernail scrapings of trayvon martin, you did not find any of george zimmerman's dna there. is that correct? >> no, there was nothing foreign to trayvon martin. >> if we could move to the second part, which i believe would be the fingernail scrapings from the left hand. if you could, tell us your findings as to that, sir. >> yes. the left hand stick was not tested for the possible presence of blood. it did not have any staining on it whatsoever. i swabbed that, performed the testing, and i did not get any