A 9-year-old boy was stopped by police after being made to drive his intoxicated father to a Mosgiel bottle store.
Acting Senior Sergeant Anthony Bond said police stopped the car at 7.30pm on Saturday, and found the boy behind the wheel.
His 32-year-old father, who was intoxicated, had made him drive him to a nearby bottle store to buy more alcohol.
Investigations were ongoing.
It was also a busy weekend for police dealing with a "disappointing" number of people who got behind the wheel after drinking, including one who was nearly three times the legal limit.
It comes as police step up their efforts to prevent drink-driving during the festive summer holiday season.
Seven people were caught over the weekend, and another case is awaiting blood test results.
Acting Snr Sgt Bond said a checkpoint in Taieri Rd between 11.10pm and 12.20am caught one person who recorded a breath-alcohol level of 214mcg. The driver would be issued with an infringement notice.
At 7.30pm on Saturday, a 22-year-old man was seen pulling his car into the Kensington Pub car park and stumbling out of it.
He recorded a breath-alcohol level of 695mcg, and was found to be a disqualified driver. He will appear in court on December 10.
Another checkpoint was held on Saturday at the north end of George St between 11.30pm and 1.30am on Sunday morning.
Three people were processed for drink-driving, recording 552mcg, 757mcg, and 807mcg respectively.
At 1.45am on Sunday, a 28-year-old man was seen by a member of the public speeding and going through red lights. Police found him in Highcliff Rd, and he recorded 600mcg.
He will be appearing in court on December 17.
A 23-year-old man was seen swerving within his lane. He failed a breath test, and requested a blood test.
"He was apparently the ‘sober driver’ to head back with his passengers to Milton.
"The officers note he was clearly intoxicated."
And at 9.45pm on Sunday, a 26-year-old woman was stopped by police in North Rd.
She recorded 1178mcg, and will appear in court on December 18.
Acting Snr Sgt Bond said it was disappointing so many people were still drink-driving.
National road policing manager Acting Superintendent Gini Welch yesterday said police would be working hard throughout the holidays and all summer long to keep everyone safe.
"We’ll be doing everything we can to prevent drink-driving through impairment checkpoints and random roadside testing."
In the five years from 2015 to 2019, 374 people were killed in crashes where the driver was over the legal alcohol limit, and nearly 1600 people were seriously injured in those crashes, she said.
