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

No, we specifically look for the cannabinoids. Delta-9, 11-Hydroxy and the carboxy. The reason for that is it is what's called a dwell time. It is how long the instrument gets to look for a particular compound.

Because we are dealing with nanograms, which are basically a billionth of a gram. It is like you have a dollar, that's as close as you are to be being a billionaire, that's what we are looking for.

So the instrument really has to focus in. We can do screens, but that's under a different criteria. For this we would just use, focus the instrument in on the cannabinoids.

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