is a criminal offense if you drive with a Blood Alcohol Concentration
(BAC) in Excess of .08%
does it mean and how do law enforcement officers measure blood
alcohol level concentration?
enforcement officers use portable breath-testing machines to find
out whether a driver has a blood alcohol level above the legal
limit. A breathalyzer is a device that samples the breath of a
suspect and uses a chemical
reaction involving alcohol that produces a colour change.
the breathalyzer are chemicals with different colours. Potassium
dichromate, K2Cr2O7, is
a yellow-orange compound. When
alcohol vapor makes contact with the yellow-coated crystals, the
color changes from yellow to green.The degree of the color change
is directly related to the level of alcohol in the suspect's breath.
taken with the Breathalyzer are reported in units of percent blood-alcohol
concentration (BAC). In B.C., a BAC of 0.08 % is sufficient for
a DUI (Driving Under the Influence) or DWI (Driving While Impaired)
conviction. A blood alcohol concentration of 0.08% is equal to
grams of alcohol per 100 mL of blood