Surely a blood test would indicate exactly how much alcohol is in ones blood, but breathalysers can be used as evidence against a driver. So my question is how a breathalyser works to detect alcohol in breath and how accurate are they?
In: Technology
Alcohol is not digested by your body and directly enters your blood stream. Our blood also passes through our lungs where some of the alcohol passes through membranes and evaporates in the lungs because of its volatile nature. Now when you blow into a breathalyzer, if there is alcohol in your blood a chemical reaction occurs in the machine which causes a colour change. This shows the amount of alcohol in your bloodstream.
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