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

Well, I was able to do a presumptive test for blood, which is just the first step in our process of testing blood. Presumptive test, it is a sensitive test, but it is not specific. So it indicates that the substance you are testing for is possibly there. In this case, blood, so that was positive.

To do a confirmatory test, you need to actually take more of that sample. Since there wasn't that much to begin with, I didn't want to use any more of a sample since there wasn't that much, it would have to go to DNA.

So rather than, I guess, use up any more of a sample, I just indicated that confirmatory testing was impossible, but blood was presumptively detected.

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