Members of the public entering two bars, in King Street, Maidenhead and High Street, Slough, were swabbed and tested with a drugs itemiser, which gives a reading indicating the amount and type of drugs present.
A total of 117 customers were swabbed at the bar in King Street, with seven testing positive for being in contact with drugs.
In Slough, 47 customers were tested, with six positive results.
No further action was taken by police after only small drug residues were found following further investigation and no drugs were found on those who were searched.
The operation was carried out by neighbourhood policing officers, local authority licensing officers and special constables.
It was part of an on-going initiative aimed at keeping people safe on nights out.
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