Let's say you had a drink or two but don't feel you are under the influence of alcohol. However, you are arrested on suspicion of drunk driving and offered the choice of taking a breath or blood test (or, in some states, urine). Most DUI suspects choose the breath test -- a choice which could doom your chances to prove your innocence. Consider the following advice when deciding which test to take:

1. If you smoke cigarettes, you may want to pass on that Breathalyzer mouthpiece the officer is handing you. Scientific research has shown that smoking can raise the test result considerably -- enough to get you charged and convicted of drunk driving. This is because most breath analyzing devices will falsely report acetaldehyde as alcohol. Acetaldehyde is a compound produced in the liver in small amounts as a by-product in the metabolism of alcohol. However, scientists have found acetaldehyde concentrations in the lungs of smokers are far greater than for non-smokers. ("Origin of Breath Acetaldehyde During Ethanol Oxidation: Effect of Long-Term Cigarette Smoking", 100 Journal of Laboratory Clinical Medicine 908). Translated: because breathalyzers can