<P> Police officers can obtain reasonable grounds from observations they make and information they receive, including the results of the other demands listed below . </P> <P> These breath samples are typically taken at a police station by a qualified technician, after a person has been arrested . </P> <P> If a person is unable to give breath samples (usually due to injuries suffered from a traffic collision), a police officer can make a demand for blood samples, under the direction of a medical doctor, and performed by the same doctor or a nurse . </P> <P> If a police officer has a reasonable suspicion that a person has alcohol in his or her body, and that he or she has been operating or has had care or control of a vehicle within the past three hours, the police officer can demand that person provide a suitable sample into an approved screening device . These devices are usually calibrated to display fail if a person has a BAC above 0.1 percent, warn or caution if a person has a BAC between 0.05 and 0.1 percent, and a numerical value if the person has a BAC below 0.05 percent . </P>

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