Shop-keepers in Leicester are being warned by police against selling alcohol to youngsters during the Christmas break.
Earlier this week a 14-year-old girl, posing as a customer, visited 18 off-licenses in the St Matthews area of Leicester, accompanied by officers.
Three of the outlets sold alcohol to her.
Police said shops caught selling alcohol to underage people could face an £80 fine.
Pc Jon Webb, from the neighbourhood action team in the city centre, said: "One thing that officers noticed when carrying out the operation was the lack of staff asking for ID from the young girl. A lot of them just asked for her age.
"ID is the only way people aged 18 and above can prove that they are old enough to purchase alcohol, that's why it is so important that staff remember to ask for it."