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A breathalyser detects the presence of alcohol in the blood.

Alcohol gets into the blood when you drink it.

The body processes alcohol at a fixed rate (1 unit, that is 10 ml of pure alcohol, an hour).

Therefore if you have consumed 6 units, the breathalyser would still detect the presence of alcohol after 5 hours. If you had just consumed 4 units the breathalyser would not detect alcohol after 5 hours.

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