Surrounded by glittering waters, Rwanda's remote Iwawa island appears idyllic, but it has housed thousands of drug users, as well as reputedly those the authoritarian government deems unsuitable for society.
Isaac Mugange was an alcoholic and heavy smoker of cannabis, but the 24-year computer technician was sent to the Iwawa Rehabilitation and Vocational Training Centre, a tiny island in the vast waters of Lake Kivu, to wean himself off drugs.