City Deputy Police Chief Supt M. Chandra said seven out of eight drivers who took a breathalyser test using the Evidential Breath Analyser Equipment (EBA-II) during a roadblock along Jalan Kolam early Saturday had exceeded the allowed alcohol limit.
He said they could be charged under Section 45A of the Road Transportation Act 1987.
This carries a fine of between RM1,000 and RM6,000 or a jail term of up to 12 months.
The roadblock was part of the Ops Cantas Khas (Traffic), code-named Ops Mabuk, mounted by the Kota Kinabalu Police Department's Traffic Division, involving two officers and 15 personnel.
A total of 11 summonses were also issued to drivers for various traffic offences.