Police are cracking down on the illegal sale of alcohol to children in rural areas of West Yorkshire.
It follows an operation in Haworth where several licensed premises were tested.
One shopkeeper was caught in the operation and has been given a warning by West Yorkshire Trading Standards, and will continue to be monitored.
Those found to be persistently selling alcohol to young people risk fines of up to £10,000 or losing their licence.
West Yorkshire Police said alcohol has been identified as one of the main causes of anti social behaviour among young and older people.
Police said they had conducted a number of test purchasing operations throughout the year so far in Haworth and the wider Worth Valley area.