If you have been arrested for DWI and you gave a blood sample, the results of the test on that sample could be inaccurate or just plain wrong. Here are just a few of the things that could affect the accuracy of the test:
1) If your arm is swabbed with a pad containing alcohol, this could skew the test results
2) Storing the blood sample at room temperature for an extended period of time, meaning 5 days or so, could lead to more alcohol being created in the tube of blood
3) The sample must always be returned to room temperature before testing
4) The testing is done with a gas chromatograph. Guess what? This machine doesn't always work properly and there are ways to find out if it is not working properly, such as: a) examining the print-out of the results, the "chromatograph," to see if the machine is separating out the various chemicals in the blood, such as ETOH (the alcohol in beverages) b) examining the separation matrix to see if the control mix used to test the machine indicates that it was working properly. Bottom line is--if the machine isn't properly separating out the alchohol from other chemicals in the blood, then it is not going to be able to quantify the amount of alcohol in the blood.
This machine is complex, and the prosecutor must be able to prove it was working properly. If they can't explain how it works and prove that it was working properly, then they should not be able to convict you based solely on the results of the blood test.
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