It may be difficult for pubs and off-licences to detect whether customers are old enough to be sold alcohol.
But the law is clear - it is their responsibility to make sure that none is sold to those underage.
The results of the latest clampdown on underage drinking are most disappointing.
Nearly half the premises targeted in an undercover police operation served beer to a 14-year-old girl and a 16-year-old boy.
Police say this is the start of a concerted effort across the county to curb the practice - so publicans and managers had better watch out.
The penalties can be severe, with written warnings, fines and ultimately the suspension of licences. The message to those behind the bar must be - if in doubt, refuse to serve.
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