In Tennessee, people who are convicted of DUI after a blood or breath test are required to pay the Tennessee Bureau of Investigations, which performs those tests, a $250 fee. People who are not convicted are not required to pay the fee. The state's Court of Criminal Appeals recently found that to be unconstitutional because it sets up an apparent conflict of interest and calls the trustworthiness of the test results into question.
Being pulled over while you're on vacation can suck all the fun out of your trip -- especially if you are arrested for DUI. Nashville is a fun town, but Tennessee has little patience for drunk driving.
The Supreme Judicial Court of Massachusetts has ruled that field sobriety tests are not an appropriate measure for whether a driver is under the influence of marijuana. Although the ruling doesn't apply directly in Tennessee, it could be influential because it involved a review of the current science on accurately detecting marijuana intoxication.