The number of people caught drink-driving in Nottinghamshire has fallen, despite an increase in tests.
Police figures show in 2010 more than 14,000 drivers were breath-tested - almost 650 more than the year before.
Despite the rise, the number refusing or failing was down by more than 300 to 1,483.
Officers said the results, released at the beginning of the force's summer drink driving campaign, showed how hard they worked to catch offenders.
The figures also showed drink or drugs were found to be the cause of seven fatal collisions in the county during 2010, compared with nine in 2009 and 12 in 2006.
The summer campaign is a response to a traditional increase in the number of people who drive under the influence of alcohol or drugs, with more people socialising in the warmer, lighter evenings.
Nottinghamshire's head of road policing, Chf Insp Andy Charlton, said: "Just as there is no justifiable reason to drive a vehicle having had a drink or while under the influence of drugs, there is no time of year at which you will Nottinghamshire Police less active in the enforcement of the law.
"The fact that we substantially increased the number of tests last year demonstrates how committed we are to reducing deaths on or roads."