Answer: Assuming there were was the correct amount of preservative in the blood sample, it was properly stored, the preservative was properly mixed when the blood was first put into the vial…etc..then it’s possible that the blood tested 4 weeks later could still be fairly accurate. But that’s a lot of ifs. You should consult with a DUI attorney in more detail about your case and discuss the options of running a blood split to test for preservative and BAC amongst other potential defenses to your DUI case.
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