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>> i know what your process was. you just swabbed it from the elbow down to the cuff, not having seen any blood, correct? >> correct. i first used the filter paper to rub it and test that for the possible presence ef of blood. that was negative on both sleeves. so i performed swabbing, dna testing and there was no dna foreign to trayvon martin on either of those. >> if it's not blood and you're pretty sure it's not blood, are you looking for skin cells or other source of dna perhaps the. >> yes any foreign dna that might be on these sleeves which could be touched or skin cells, it could potent...