Trying to outsmart the police has become a lot more difficult, with new technology fitted to booze buses.
Central Districts Police have fitted what's called a biometric system to its two buses, and it means officers will be able to instantly confirm suspects' identities without having to go back to their station.
The system lets officers digitally take fingerprints and photographs of people they intend to charge and compares that information against existing police records.
From an operational point of view, it happens instantly and any new information will be stored for future reference.
Inspector Dave White, CD road policing manager, said the technology will only be used on drivers who blow over the drink-drive limit in a roadside breath test or commit an alleged offence for which they can be summonsed.