BACtrack s75 PrO User Manual

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The alcohol concentration in the breath is related to that in the 
blood, and because of this, an individual’s BaC can be deter-
mined by measuring alcohol in the breath. The ratio of breath 
alcohol to blood alcohol is generally estimated to be 2,100:1. 
Therefore, 2,100 milliliters (ml) of alveolar air will contain ap-
proximately the same amount of alcohol as 1 ml of blood.
Alcohol is a Drug
alcohol is the chemical (ethanol or ethyl alcohol) resulting from 
the fermentation of grapes or grain. alcohol is absorbed directly 
into your bloodstream. From your bloodstream, the fluids in your 
body tissues absorb the alcohol. Your brain is made up of a 
large concentration of fluids and will absorb a large amount of 
any alcohol you drink. Your liver eliminates the absorbed alcohol 
at its own rate of time and nothing you eat or drink can speed up 
the process. Your liver does this by oxidizing the alcohol (convert-
ing it into water and carbon dioxide). Coffee, food or any other 
“cure” will not sober you up. Only time will do that.
How does alcohol affect my body?
alcohol is a depressant. It has a relaxing effect on the muscles in 
your body. The muscles of your eyes relax and lose focus. Your 
eyesight will become fuzzy and you may experience double 
vision. Brain activity is slowed. Your judgment, reflexes, and 
coordination are all negatively affected.
some vision impairments that occur when you have been  
drinking include:
narrowing of your field of vision
reduction in your depth perception
Decreased ability to see in darkness
 Increased sensitivity to glare and a longer time  
for your eyes to readjust from the glare
some mental (brain) impairment can occur when you have  
been drinking, including:
reduced awareness of danger
Becoming overly confident and reckless
Difficulty in making decisions
reduction in balance
slowed reflexes
Impaired judgment
How does alcohol affect my driving?
we can’t emphasize enough how dangerous it is for you to  
drink and drive. Your vision and your brain are the most impor-
tant factors in driving safely. If you jeopardize either by drinking, 
and then you drive, you are likely to be involved in a serious or 
fatal collision.
From California Department of Motor Vehicles (