Will I Pass A Breathalyzer If I Drank A Beer At 5:00 P.m. And Take The Test At 8:30 A.m. The Next Day?


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Sarah Devine answered
It basically depends on how much alcohol you have consumed the day before. It takes 1 hour for 1 unit of alcohol to be removed from the body and different types of drinks vary in unit quantities. You can work out how many units you have consumed by using this calculation:

Take the amount you have drank in milliliters and multiply it by the percentage of the drink and divide by 1000. This will give you the units consumed and noting that each unit takes an hour to exit the body, you can work out how long it will take for your body to be alcohol free.

Breathalysers work by detecting the alcohol through CO2 emission, hence breathing into the device. Most people assume that as it is through the mouth, it measures the breath. This is not true and the only way to ensure you pass the test is to avoid any situation where it may occur. This means waiting it out until you are completely safe from failing any alcohol test.

There are other contributing factors as to how alcohol affects the body. Some of them are:

  • Weight and size of the person
  • How much food they have eaten before drinking as alcohol is absorbed slower on an empty stomach
  • Their general tolerance of alcohol for example, if they drink a lot their body will be used to the alcohol and not be so badly affected by it
  • Gender and age as for women, the RDA of alcohol is 2-3 units and men 3-4. If the person is really young or above middle aged, the alcohol will have a stronger affect
  • Any medication they have taken

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