Most counties outside of Nashville Davidson County use blood tests to determine blood alcohol concentration.Most police departments in Willamson County such as Franklin Police Department and Brentwood Police Department always request a DUI suspect to submit to a blood alcohol test.Also Sumner County law enforcement agencies like Hendersonville Police Department and Gallatin Police Department use blood alcohol tests as well. Here’s a short video on some issues that come up in a DUI blood test case. 

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