Regan Walker was trapped above the limit in the Glasgow Pollokshaws on May 9 this year.
The 24-year-old claimed he drank lager before driving off in his Ford Fiesta.
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Walker agreed with a sheriff when he said it was “a few expensive pints”.
Walker pleaded guilty at Glasgow Sheriff Court to drunk driving.
The court heard that police attention was drawn to Walker’s engine and their blue lights flashed.
Walker pulled over before officers approached the car.
Prosecutor Rachel Wedlock said: ‘Officers spoke to Walker who was the driver and there was a strong smell of alcohol coming from his car.
“Because he scrambled his words and was tired of looking him in the eye, a road test was done.”
Walker was then arrested before another test was carried out at the police station.
Ms Wedlock said: “This test confirmed 27 micrograms of alcohol in 100 milliliters of breath.”
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William Mackay, defending, told the court: “He was with his cousin and he recklessly drank two pints of lager as he told the police.
“He is a young single man and in the army as an infantryman.
“Not being able to drive is a disadvantage for him in the army but whatever he does will cause a problem for his social life.
“He is aware that the military will also charge him as he has brought discredit on the military and will be heavily fined.”
The court, which included his supervising officer, heard Walker’s previous convictions included a threatening or abusive behavior charge as well as an air rifle charge.
Sheriff Brian Cameron said: “It’s a couple of expensive pints, Mr Walker.”
He said, “Yes, sir.”
The sheriff continued, “You won’t make that mistake again, will you?”
Walker said, “No, sir.”