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Police arrested a driver in Gillingham and seized his car after he failed a roadside drug test.
Officers stopped the VW Golf overnight after checks showed it was not insured.
In a tweet, Kent Police's Roads Policing Unit said: "On top of his six points and a hefty fine for not being insured he also failed a roadside drug test.
"Free night in custody for him and depending on blood results potentially a long driving ban."
Kent Police has been contacted for more details.