Blood analysis by a forensic scientist proved a Pinchbeck man was driving under the influence of the banned substance ketamine.
Police stopped Joseph Pike in Bourne after a patrol car officer saw his Renault van swerving from the verge to the centre white line and then force another car to brake when he cut if off as he right turned into Cherry Holt Road.
Marie Stace, prosecuting, said the officer believed Pike was “under the influence of something” after getting negative results from a breath-test and roadside screening test.
Pike was arrested and taken to the police station, where blood was taken.
Miss Stace said the analysis showed ketamine still in his system and “prior use of cocaine and ketamine”.
She said Pike was convicted of driving under the influence of drink or drugs in 2010.
Magistrates banned Pike from driving for three years, fined him £250 and ordered him to pay £85 costs and a £25 victim surcharge.
Pike (25), of Rotten Row, admitted driving while unfit through drugs.
Solicitor Carrie Simson, mitigating, said Pike has used drugs since he was 15, but hasn’t used any since December 15 – the day after the offence – as he realised his life was “spiralling out of control”.
Mrs Simson said Pike works as an electrician and he will keep his job despite the ban.