Zak Bentaher, 21, of Kirby Road, Portsmouth, was on trial at Portsmouth Crown Court.
Jurors found him guilty of possession of cannabis, a class B drug, with intent to supply.
He was also found guilty of possessing criminal property.
Addressing the defence barrister, Judge Robert Hill said: ‘What the jury won’t know is he’s subject to two suspended sentences for drug-related offences that he’s going to be in breach of.
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‘He was found to be driving around Wandsworth in possession of cannabis on one of the nights of this trial.’
Bentaher is due to be sentenced on February 12.