BACtrack s75 PrO User Manual

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 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.

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

•

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 (http://www.dmv.ca.gov)