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This procedure will not completely reverse the damage inflicted by Ryan's previous addiction to the Class B drug, but it will help him manage the symptoms.

Speers, of Fairfield Road, Bude, Cornwall, is also charged with one count of possession of a class B drug, cannabis, and a class C drug, Etizolam, which he also denies.

He later admitted causing death by careless driving, causing death by driving a vehicle without a licence, causing death by driving a vehicle without insurance, and possession of a class B drug.

Importation of a Class B drug has "fairly hefty" prison sentences, he says.

The men, aged 33 and 48, have been charged with production of a Class B drug and illegally abstracting electricity.