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.
normally when an exhibit comes from the medical examiner s office, it has an m.e. as the abbreviation. but it could be called anything. really it s just a letter number designation that s unique to that sample in this case. and in terms of you have the same on mr. martin in terms of you have two numbers, obviously one from his father, one from his mother. is that correct? yes. okay. let s open the microphones here. let me introduce you to tonya smith, criminal defense attorney. mike brooks worked in law enforcement for years and years. law enforcement analyst for hln. let s just break away. because for a minute, this is just getting a little wonky, if i may. looking at all the loci versus the locus versus the numbers versus the assignment from this guy s particular crime lab. bottom line is for me, we re going through so carefully because dna matters and it could prove key here. right? that s absolutely right. you know, we live in the era of csi. jurors expect to hear from
dna results from that swab. i believe you also examined some swabs, possible dna swabs from a skittles bag and also a flashlight. is that correct? yes. may i approach the witness again, your honor? yes, you may. sir, i m showing you state s exhibit 169. i ask you if you recognize state exhibit 169, sir. all right. so quickly they were talking specifically about the scrapings that were found underneath trayvon martin s fingernails and the fact was no foreign dna was found. translation, no george zimmerman dna was found. which is not consistent with what george zimmerman was saying earlier in the trial that we
i interpret that and create the dna profile which is essentially a set of numbers. i can use those numbers for comparison. when you re going i m sorry. you need a minute? when you re going through the extraction process, the stain, what you believe is a stain, might you be given the actual exhibit itself? like if i gave you this pen? or may they be a swab from this pen that you re first looking at? it varies. sometimes i get an actual item like a pen and say who was possibly handling this pen. and then i have to take a swab and swab that pen for any skin cells that might be left behind. sometimes i get a swab that was collected from an item. it was collected by the agency that submitted that. say, sanford police department or orlando police department. they swabbed the pen themselves, put that swab in a box and sent that box in to be tested. then i just have the swab to work with. i take a cutting of that swab with a scalpel, put that into
and then there was a mixture. the major was matched the defendant, george zimmerman? yes. and you were able to exclude trayvon martin as having dna on the pistol grip. is that correct? yes. trayvon martin was excluded as being a possible contributor to this mixture on the grip. i want to move next to the second part of the swab from the pistol trigger this time, on the previous exhibit that you examined, did you again perform or try to do the same testing, or tell us what that significance of that fdle exhibit 3 was, sir? the 21-b was a swab collected from the trigger of the pistol. i did not perform the chemical test for blood on that exhibit. the swab itself didn t give me an indication that blood might be present. okay. so this crime lab analyst is walking through these multiple swabs that he took on george zimmerman s gun to see whose dna was where.