What methods does a law enforcement officer use to test blood-alcohol level?

What methods does a law enforcement officer use to test blood-alcohol level?

When a driver is stopped as being suspected of driving under the influence of alcohol, the officer will first look at the general demeanor of the driver. And then will probably administer what we call standardized field sobriety tests that is have the driver get out of the car walk a straight line heel to toe, or conduct what we call the one leg stand keeping one leg raised while counting to 30. If the officer still thinks there's a good chance that, that individual is impaired the officer normal will carry a portable breath test device and will administer a quick breath test to that individual. If that individual registers a reading greater than .08 percent in all states in the U.S. that driver will then be arrested taken back to the police station where more extensive testing will be conducted.