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About the four swabs that were taken from the defendant s gun. the first one i want to talk about is the swab taken from the pistol grip. if you could, using that part of state s exhibit 203, tell us the significance of your findings there. and just describe each part that is shown up there. hopefully the jurors can all see that. it s got an fdle number, right, exhibit number? then you ve got a description of what it is. swab 21-a from pistol grip. is that correct? we. this is basically a summary of the testing i did, the results of that testing and the statistical analysis. over here, this is the number that it got this exhibit got assigned when it came into the fdle laboratory. i usually refer to them as the agency s, the sanford police department s number, which is over here. which would be it was dms-21. ....
Since there were four swabs in the box they got labeled a, b, c, d. swab a here was from the grip of the gun. and i did the chemical test for the possible presence of blood on the swab which gave me a positive result. so that s this column here. whether or not i did that chemical test. the next column is whether or not that sample gave me an indication of a mixture of multiple people or if it was a single source. so this one here, yes, meaning i got a mixture of dna from the testing of that sample. i was able to resolve this mixture out. i was able to pick out or determine the major dna profile in that mixture. and that s right here for the major. i got a complete dna profile which matched george zimmerman. and then the statistic here would be the random match probability. the probability that you would pick a random person off the ....
Segments. they don t actually code for any physical characteristic or any kind of molecule inside your body that s doing a job. they are just repetitive, noncoding regions of dna. and i can take advantage of that fact. the fact that those repetitive sequences vary from individual to individual. so i can use these short segments of dna to develop a profile for that individual. and if you could i d like you to break down in terms of the str process, are there, i think, three or four steps that you have to go through in order to first determine whether you have enough dna to actually develop it? yes. the first step would obviously be analyzing the item of evidence for the possible bodily fluids, flood, semen, saliva as well as hair and skin cells. once i have that stain that i want to perform dna testing on i take a small portion of that stain or swab and put it in a tube and use heat and chemicals to perform what i call an extraction. ....
See a red round staining on the article of clothing or swab or whatever it is, i ll take a rubbing of that stain. try to rub off a little of that material on to a small piece of filter paper. and i apply a series of three chemicals. if i get a pink color change at the end of that series that would give me an indication that would be positive for the possible presence of blood. before we get into the heart of why you re here i want to talk briefly about the significance of your findings. assuming you get dna results, i want to talk briefly about the population matters. let me just ask you some questions regarding that if i could. when you examine the results, let s say you get an str testing with do you then determine the probability of a match in terms of what the probability you know it s it? tell us a little bit about that sfwl yes. when i have a match, when i have a single source profile or a mixture and someone matches that dna profile or they re included in that mixture, i need ....
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, an ....