"Enquiries are still ongoing in relation to this operation, which will help determine any action taken as a result.''
The police regularly carry out controlled operations to ensure compliance with the Sale and Supply of Alcohol Act 2012.
The operations helped to prevent the selling of alcohol to young people.
Gerrish warned that police would continue their tests regularly and therefore urged all licensed premises to be vigilant when selling drinks, particularly to customers who looked young.
"We will continue to conduct these operations on a regular basis and we would like to remind those in the hospitality industry that if a person looks under 25, then please make sure that you ask them for ID.''