Have you been charged with driving under the influence? Chances are when you were pulled over a police officer administered a breathalyzer test. The results of the test may be used as evidence of an over-the-limit blood alcohol level, but many factors can affect the accuracy of a breath test. In fact, peer-reviewed studies have shown a 50 percent margin of error when comparing breathalyzer results to actual blood alcohol content. Is it possible the blood alcohol level estimated by your breath test was wrong? Yes. Here are four factors that could have compromised the results of your test.