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Bees to see if they have levels enough to worry about. we're going to take aisopropyl. and put the bees in there. >> how many? >> that's probably good right there. pour it through this screen and then the alcohol goes through the filter paper. i don't see any mites. doesn't mean we don't have mites at all but certainly they're not in heavy infestations. so that's good to know. >> but if it's not the mites killing george's bees, what is? for centuries, farmers relied on wild poll ninators could feed a getting a good feed would help the crop. but agriculture into business,

We're going to take isopropyl. that's rubbing alcohol. you can go ahead and slide those bees in there. >> how many? >> that's probably good right there. pour it through this screen and then the alcohol goes through the filter paper. i don't see any mites. doesn't mean we don't have mites at all but certainly they're not in heavy infestations. so that's good to know. >> but if it's not the mites killing george's bees, what is? for centuries, farmers relied on wild pollinators could feed and getting a good diet while pollinating the crop. it was a win-win situation. but as agriculture has grown ...

>> 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...

Rub a little of that material onto a small piece of filter paper and i apply a series of three chemicals. if 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 ask you some of questions regarding that, if i could. >> when you examine the results and get an str test, do you determine the probabilities ...

Violating livers' and sampson's civil rights. kofoed pleaded not guilty to all charges, defiantly told reporters he'd rather go to prison than resign, even passed the polygraph and was cleared in an internal sheriff's department investigation. so you wake up one morning and they say you're a criminal. >> well, it kind of was like that, but it was more of a long process. and i didn't do it. i just didn't. and it doesn't make any sense. >> narrator: kofoed blamed the stain on accidental contamination. somehow, he said, blood from the victim, wayne stock, ended up on that filter paper probably ou...