Drunk driving is one of the most frequently prosecuted crimes in the State of Michigan. There are two different ways that a person can be prosecuted: one way is by showing a breath, blood or urine content that is at an unlawful level. An unlawful level is .08 grams per 100 mililiters of blood/breath/urine or higher. The other way is to convince the jury that there is visible evidence of impaired driving. Impaired driving is defined as driving with substantially less ability than an ordinary driver because of the consumption of alcohol. If you are charged with drunk driving there are many issues that you need to consider and you should definitely consult with an attorney who is familiar with both the substantive laws as well as the biology behind the body's consumption of alcohol and the science behind testing a body's chemical content.