powerful machine when a person is too intoxicated to have adequate control of the machine. The intoxication element is proved by one of two methods: (1) showing a certain level of blood alcohol or illegal drugs, or (2) showing the person was impaired. The first method is the one most often used. It does not rely on anyone's observations of the defendant's conduct, but rather on the results of a blood or breath test. A common statutory scheme requires a person suspected of being drunk or drugged during driving to give a sample of their breath or blood for testing. This so-called implied consent comes about because the statute provides for it whenever a person gets a driver's license. Once the sample is given, it is analyzed by a machine that measures the concentration of alcohol in a perso
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