Police say they were left severely disappointed when a driver blew almost six times the legal alcohol limit in Beaconsfield on Tuesday 6 August.
Officers set up a booze bus site on O’Shea Road when a vehicle drove through just after 2.30pm.
The driver from Pakenham underwent a preliminary breath test, before undertaking an evidentiary breath test and returning an alleged result of .294.
The 55-year-old’s licence was immediately suspended, and his vehicle was impounded at a cost of $895.
He is expected to be charged on summons with drink driving offences.