Generalisation? How so? go and check interpol and search Nigerian drug dealers. perhaps not all nigerians are drug dealers, and not all drug dealers are nigerian, BUT, the nigerian drug networks are the biggest internationally: they have been since slave trade days/smuggling days . Nigerians are bought into SA illegally to assist with building these smuggling drug running networks, they are very expansive. in our area where i work, the majority of nigerians in a twenty block / 2km radius are involved with, running or benefitting from drug dealing. So, when i stop someone to search and they are nigerian i will check their passport and so called " refugee status papers" more carefully, and i will check them for drugs. so, although the chief of police in SA could have been more diplomatic, we do have a serious problem in SA with Nigeria Drug dealers!