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So it actually, it is a lot more grains than a cartridge loaded with powder, with ball powder. so you have a denser pattern. and because of the configuration of the grains of powder, they actually go out further. and i know it's ball powder, because the firearms examiner states that in her report. >> dr. di maio, the exhibit you just published to the jury is now on the screen. the detail may not be as good as on the photograph itself, but that's in evidence, the jury can review later. this is what you described as the 2 inch by 2 inch tattooing pattern? >> yes, sir. >> is that what helps you w...

Inches or several feet, where you know the powder would have dropped off. >> right. if it's less than half inch, you would see a hole surrounded by dense foot, and you would not see individual powder tattoo marks. powder tattoo marks begin, in the metric system, 10 millimeters. it's about half inch. and then begin to -- you know, the powder gets broader and broader. >> how does the pattern get broader as the distance increases? >> it's kind of like with a hose. when you have that spray coming out. you know, the cone shape, and, you know, the farther you get from the end of the hose, the bigger...

Pattern of the density, they'll give an opinion as to the range. well, this has been used for 75, 80 years, to make judgments. was the problem was, does it really reflect what happens on the skin? and i got curious about that, so i decided to make a determination, and i did experiments. and you have to use living animals to do it. and based on the experiments, i found out that, yes, it's valid. to determine the size of a pattern by shooting against like white paper is valid, out to at least 18 inches. so i got interested in there, with and then i did determinations of powder that to go from ha...

Person was alive at the time. you do not get true powder tattoo marks on dead people. and there was a distribution measuring 2 inches by 2 inches. and a certain density in these tattoo marks. and this indicated that the gun was not against the skin. it was not a half inch away, it was measure an inch, and based upon the concentration of the marks, and the size of the pattern, it's my opinion that the muzzle of the gun in this case was 2 to 4 inches away from the skin. so the barrel of the gun was against the clothing, the muzzle of the gun was against the clothing, but the clothing itself had ...

Colorful statements he made in the high profile statements you referenced. both of those defendants were convicted of murder, notwithstanding vincent di maio testimony for the defense. most defendants are convicted in american criminal courts but he is testifying about a very important point for george zimmerman in this case and that is that the gunshot residue and the pattern of the bullet going through two shirts that trayvon martin was wearing and into his body, the defense says proves their theory that trayvon martin was on top angled over george zimmerman. that is the import of the doctor...