The man was processed for drink-driving after a minor crash in Roslyn about 11.20am yesterday.
Senior Sergeant Steve Aitken said the driver had a breath-alcohol level of 1294mcg.
"It's an extremely high breath-alcohol level, especially for that time of the day," he said.
The driver allegedly crashed his car into a wooden fence on a traffic island on the main thoroughfare through the Roslyn shops.
No-one was injured in the incident, which resulted in minor damage to the fence and car.
Snr Sgt Aitken said when police arrived at the scene, the man had driven into the nearby supermarket car park, "possibly to try and get away". He was charged with careless driving and drink-driving and would appear in court next week.
His driver's licence was immediately suspended for 28 days, Snr Sgt Aitken said.
Mosgiel police are appealing for information about the vandalism of at least 17 letterboxes in the town on Saturday.
Officers responded to reports of 17 letterboxes being damaged or destroyed in Bush Rd and Argyle St and at surrounding addresses.
Snr Sgt Aitken said the offending occurred on Saturday night and he urged anyone with information to contact Mosgiel police.
"Someone must have heard or seen something," he said.
