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The EDTA test is so inconclusive the FBI doesn't even use it. They were persuaded to test for it in this case. While it should show up the typical amount of sample blood taken from the tube would actually read so low on the scale of existence that it shows up as none.
It's like .001 of a milliliter. The relative values of it even in blood that it is KNOWN to be in comes back undetected because of how little is used.
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