Drug traces found on the hands of four people saw them refused entry to a popular pub.
Police officers from the Bicester Town Neighbourhood Team carried out drug testing at Yates’s in Sheep Street on Saturday where they swabbed the hands of more than 200 people.
Revellers with high readings were searched by police and four people were turned away.
In May, an identical operation was carried out at a different pub in the same street and saw one arrest among more than 600 swab tests.
PC James Waterson, from the neighbourhood team, said “This gave us the opportunity to work in partnership with the licensees and will hopefully reassure our communities that a multi-agency approach is being taken to manage the night time economy and reduce violent crime and alcohol related incidents.”
The neighbourhood team also conducted an alcohol test purchase operation in Bicester last week where underage volunteers tried to be served.
But all 10 stores tested passed as the underage person was asked for ID and refused the sale of alcohol.
If youngsters are served without proof of age, police officers have the power to fine the member of staff serving, £90 on the spot.
The drugs tests were carried out with the pub’s approval, the Licensing Department and the Special Constabulary and the alcohol test was organised with licensing officers from Cherwell District Council.