A breathtesting project piloted in Mansfield is to be rolled out in other towns.
Revellers suspected of being intoxicated were breathtested at the door by staff of some town centre pubs and clubs and refused entry if they blew a high reading.
Under the ongoing Alliance Against Violence campaign, it will now be rolled out at Worksop and Newark.
Chief Insp Paul Murphy said: “When used in other parts of the country breathalysers have helped reduce violence. We’ve already seen positive results in Mansfield.
“This provides businesses with the tools to take responsibility for tackling customers who have the potential to cause them problems.
“We hope this measure will contribute to reducing violence in our communities. We want to make sure that an evening in our town centres is a safe and enjoyable experience.”