A woman was arrested in York after she was driving while allegedly more than four times over the alcohol limit.
North Yorkshire Police said the woman provided a sample which showed 144ug of alcohol per 100ml of breath.
The legal limit is 35ug.
She provided the highest reading during a weekend crackdown. More than 50 drivers stopped and 23 arrests made between 14-17 August.
It was part of Operation Attention, North Yorkshire Police’s response to a summertime peak in drink driving following pubs reopening last month.
During the five weeks of Operation Attention, from 13 July to 16 August, police have arrested 171 people for drink and drug drive offences.
Traffic Sergeant Andy Morton from the Road Policing Group said: “The results send a clear message that if people choose to drive under the influence of alcohol or drugs and break the law, there are consequences to your actions and officers will catch you.
“The local community can be confident that these drivers will pay the price by being given lengthy bans, significant fines and even prison sentences.”