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Drivingforfun
It is not illegal to drink whilst driving, and that includes alcohol as it is the amount of alcohol in the blood that becomes an issue and every driver reacts differently as the way the body disperses alcohol differs, but there is a caveat other than the excess alcohol debate..
Drinking a non alcoholic drink in not an offence per se, same as alcohol, however, (and I have reported drivers for the offence) a driver can be reported for failing to maintain proper control of his/her vehicle, and if a crash were to occur or the driver was distracted whilst drinking, then they could easily end up be reported for the more serious offences of careless or dangerous driving.
By taking a drink of any sort whilst behind the wheel opens up all sorts of issues which could be costly in more ways than one.