Research lacking on racial bias in SA police's use of force: ISS Updated Christelle du Toit Share this: Burger says there is simply not enough data to determine if there is a racial motivation for how the police respond, but says it was clear that the police overreached their powers on Tuesday when they shot and killed Ntumba. Twitter/WitsSRC The Institute for Security Studies (ISS)'s Johan Burger says the reach is lacking on whether there is racial bias in the South African Poclei Service (SAPS)'s response to black citizens as opposed to white citizens. This comes in the wake of the death of Mthokozisi Ntumba in the Wits student protest this week.