Well, smartboy....the blood DID have anticoagulant in it. Apparently you got all your information from Geraldo and Marsha Clark.
And I gave you an example of how it can be done. Now go find a cop whose butt you can kiss.
What EDTH that might have been there, and not a bleedover from bad LCMS, was orders of magnitude lower than in EDTH preserved blood.
There is no way to preserve blood in a liquid state at that low of level of EDTH.
So this is yet another example of how it CAN NOT be done - unless you have a jury of idiots and a good defense team - then you can make it sound plausible to the uninformed.