HELSTON-BREWED Spingo was blamed for an Illogan man failing a blood/alcohol test after police saw him on October 13.
At Truro Magistrates' Court, Roy Squire, 51, of Churchtown Road, Illogan, Redruth, pleaded guilty to drink-driving after testing at 110 milligrammes of alcohol in blood, 30 points over the legal limit.
Alison May, for the prosecution, said police had been flagged down by a member of the public who reported Squire's driving to them.
John Trevaskis, for the defence, told the magistrates Squire had been given some Spingo before driving, a beer he was not used to. It was acknowledged as being stronger than many other beers and he "did not appreciate the effect it had on his driving".
Squire had been hoping to get a job as a taxi driver but that would not happen now that he was about to lose his driving licence.
Squire was fined £110 and £100 costs and surcharge and banned from driving for a year.