Many people have heard of and are familiar with the breath test as conducted by law enforcement at the time of a traffic stop where suspicion of driving under the influence is a factor. Many people have also heard the test can be inaccurate and unreliable. And then, in some cases, a breath or urine test may be deemed impossible or simply impractical and a blood test is instead ordered when law enforcement suspects a person of operating their vehicle while under the influence. The blood test is used to determine to presence and content of alcohol within your blood and possibly any controlled or chemical substances in the blood. But what if you don't trust the test performed on you or think the results are inaccurate?