Mavin has been addicted to heroin for decades. To pay for his habit he's found what he says is the easiest way to earn money, sweeping floors in gold shops. But rather than being paid to do the job, he's the one who has to pay the shop owners. The dust he sweeps up is how he can afford his “medicine”.  The Sri Lankan government runs rehabilitation centres for those who suffer from substance abuse and dependency under the Bureau of Commissioner General Rehabilitation. There are also other…