A drug user was caught after a police officer smelled cannabis through his door while returning the man's lost passport.

Joshua Jenkins, 20, of Worcester Road, Sutton, left his passport in a cafe earlier this month.

A member of the public then handed it into a policeman in a marked police car in Sutton High Street.

When PC Steven Barber went to return the passport to Jenkins and the door opened, he was met with a "sickly" smell of cannabis.

Police returned to the address, where Jenkins stayed with his girlfriend, with a warrant and found two melon-sized bags of marijuana, weighing scales and a quantity of cash in ten pound notes. Jenkins told police he was a regular cannabis user as he suffers from attention deficit hyperactivity disorder (ADHD) and his prescription medicine gave him headaches and caused him to lose his appetite.

Jenkins, a Ritalin user since the age of ten, told the court he spent around £140 on cannabis for his personal use.

The bench told Jenkins how his self medication "put him in conflict with the law."

The former warehouse worker, who aspires to be an accountant, told Croydon Magistrates Court on Friday (February 24) how he was "very good at maths".

Chief Magistrate Richard Hays was suitably impressed with Mr Jenkins' maths skills when he added up his fine faster than the bench.

Jenkins informed the bench his fine totalled £150, to which Mr Hays replied: "My, that was quick."

As part of Operation Hawk - a local intelligence led crackdown on small time criminals - police raided a series of addresses in the borough.

Last week, when police raided an address in Carshalton, they were told by the occupant, whose front room was full of cannabis plants, how he was "expecting them" as he had read it in the Sutton Guardian.