The transcripts of the Grand Jury testimonies about the shooting of unarmed teenager Michael Brown by Ferguson police officer Darren Wilson.

You might have a trace only because these are cotton swabs and when we swab something, we do two at one time. One for the prosecuting attorney's office, that's going to end up going to the lab and potentially a defense attorney so we keep one on file.

When you are holding these two cotton swabs, if you folks can picture Q-Tips, okay. You are holding two of them together, unless you're going back and forth and completely swabbing every little spot on this thing, you're not going to remove all of the DNA, all right.

You're trying to get the most profile or profiles that you can by swabbing those areas back and forth. Kind of like painting a first coat, you're not going to paint, you're not going to cover everything with your first coat. The same thing applies when we're swabbing for DNA. So potentially could be DNA left on there, but we try to get the largest sample as we can.

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