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A driver tried to smuggle 50 kilos of skunk cannabis into Dover - disguised as baby milk powder.
Lukasz Rogaczewski, 28, was stopped at the town's Eastern Docks in May driving a Mercedes van, Canterbury Crown Court heard.
The Polish shopkeeper claimed he was taking 180 tins of milk powder to Ireland.
But a Border Control officer became suspicious and opened one of the boxes.
The court heard the official needed a hammer to break open the metal seals - and inside they discovered cannabis with a street value of up to £400,000.
Rogaczewski denied a smuggling charge was found guilty and jailed for four and a half years.