Fourteen police officers in plain clothes and uniform, along with a drugs sniffer dog and handler, visited pubs in Daventry and Weedon to target drug use and provide a visible police presence.
As a result of the operation last Friday, four men wer
e arrested for possession of drugs - three for possessing cocaine and one for possessing herbal cannabis.
Patrolling police also interrupted an assault in which a 14-year-old boy was injured and which resulted in a boy, also 14, being arrested on suspicion of causing grievous bodily harm.
All those arrested have been bailed to appear at a police station at a later date.
The operation was lead by Police Sergeant Richard Tompkins, who said: "People who were out and about in Daventry and Weedon told us they felt very reassured by seeing a large police presence in the town centre.
"Licensees were also very positive and supportive about the operation – in fact many of them asked us to do it more often.
"The cocktail of drink, drugs and a Friday night is not a good mix and we are working to stamp out drug misuse and to ensure that our towns are safe and pleasant places to socialise."
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