The debate on legalising cannabis is lighting up South Africa, with its ban being challenged in the high court, raising the possibility that it could effectively be decriminalised. The family of a disabled seven year-old boy are among a growing number of South Africans calling for the drug, known locally as "dagga", to be legalised for medical purposes. A voiced AFPTV report.REFILING WITH A NAME CORRECTION (SOUNDBITE 3)