指警務人員可要求駕駛人進行的呼氣測試，用以初步顯示其體內酒精比例是否可能超過法定上限。
A breath test that police may demand from a driver to give a first indication of whether the driver's alcohol level is above the prescribed limit.
指警務人員可要求駕駛人進行的呼氣測試，用以初步顯示其體內酒精比例是否可能超過法定上限。
A breath test that police may demand from a driver to give a first indication of whether the driver's alcohol level is above the prescribed limit.