A motorist still had enough alcohol in his system from the night before for one drink to put him over the drink-drive limit.
Arthur Bailey, 67, was stopped while driving his Saab in North Road, Lancing, on March 5.
David Quelch, defending, told Worthing Magistrates Court that Bailey, a former sailor, had only had one drink of whisky on that day but had been at a celebration the night before.
He said: "The small amount of alcohol in the day put him over the limit."
Bailey, of Boundstone Close, Lancing, pleaded guilty to excess alcohol.
Magistrates disqualified him from driving for 18 months, fined him £200 and ordered him to pay £55 costs.
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