A drugs mule was found with £340 worth of heroin outside his body after he was bullied into making a drugs delivery to Exeter by gang members in London.
Jerome Sewell was arrested by police when he was seen with a known drug user and tried to escape justice by giving a false name.
Police were suspicious and found 17 wraps of heroin after taking him for a strip search, Exeter Crown Court was told.
Sewell had been put on a train to Exeter by members of a South London gang who he owed to because an earlier money laundering scam had gone wrong.
He had been given stolen bank notes which were covered in dye and was feeding them into automatic ticket machines on the underground in the hope of getting as much change as possible.
Scotland Yard officers seized his stock of dodgy money after he was caught red handed and Sewell was beaten up by the gang members and told he must make the drugs delivery to make up for the loss of the money.
Sewell, aged 19, from Stockwell, London, admitted possession of heroin with intent to supply and was jailed for 15 months by Judge Francis Gilbert, QC.
The Judge told him he found his claim to have been acting as a courier rather than a street dealer to be implausible.
He said:"You say that after being arrested last year for money laundering the gang who you were working for told you that you owed them £1,000 because you had been caught and would have to bring drugs to Exeter to work it off.
"I do not believe you only had the 17 wraps because they had a street value of £340 and by the time they had bought you a railway ticket they would have been lucky to break even on the transaction. They would probably have made a loss.
"You were found in a location well known for street dealing at a time when a local user was walking towards you with £10 in his pocket.
"You say you were acting under pressure after being kidnapped and assaulted and that you were kidnapped and assaulted again on your return for having lost these drugs."
Miss Bathsheba Cassel, prosecuting, said Sewell was arrested in the Exwick area in October last year and gave a false name.
The drugs were hidden in his body and recovered the next day despite him refusing to eat and telling officers they would have wait eight weeks for them to pass through his system.
There were 17 wraps containing a total of 5.27 grams. Each wrap would have been sold for £20 on the street.
Mr Nick Bradley, defending, said Sewell's failure to give the police his correct name was down to bravado and suggested he would benefit from supervision on the community to help him stay out of trouble in the future.
