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→Police can require you to blow into a roadside screening device
If the police reasonably suspect you have alcohol in your body, they may demand you give a breath sample by blowing into a hand-held '''approved screening device''' (or ASD). The police can use your test results to issue a driving prohibition or hold you for further investigation.
The screening device tests for alcohol in your breath. Under [https://www.canlii.org/en/bc/laws/stat/rsbc-1996-c-318/latest/rsbc-1996-c-318.html#sec215.41_smooth BC law], a '''warn ''' result means a blood-alcohol level over 50 milligrams of alcohol in 100 milliliters of blood (over .05). A '''fail''' result means a blood-alcohol level over .08.
If the screening device shows a warn result, the police will probably give you an '''immediate roadside prohibition'''. (We explain these below, under “Common questions”.)