You know that a blood alcohol test measures the concentration of alcohol -- or ethanol -- in your blood. These tests contribute to DUI charges and arrests because they help police determine if you've been drinking in a more conclusive way than just field sobriety tests. However, are you wondering how soon a test can work and how long it will be good for?
The first thing to know is that the alcohol only needs to be in your body for a few minutes in order for the test to pick it up. As soon as you take a drink, it's safe to assume that you're going to register on a test. This is important to note because you may not even feel the effects of the alcohol yet, but you can still be charged if a test is used and you're over the legal limit.